5 Reasons why relationships fall apart

The 5 Most Common Reasons Relationships Fall Apart

Have you ever wondered why some relationships last a lifetime while others fall apart despite both partners having the best intentions?

In this article, I’ll walk you through five of the most common reasons couples break up—not to scare you, but to give you practical insight you can use.

Understanding these reasons is important for two reasons. First, it can help you prevent your own relationship from falling apart. Second, if a breakup has already happened, it can help you understand what went wrong and learn the right lessons from it. Without that understanding, you risk repeating exactly the same patterns in your next relationship.

My name is Robert Marchel, and I’ve been helping people save their relationships for 17 years. What you’re about to read isn’t simply my personal opinion—it’s based on research, data, and many years of experience working with couples.

1. The Natural, Gradual Decline of a Relationship

Let’s start with the most common—and perhaps the most ordinary—reason.

In Disney movies, two people meet, fall in love, and live happily ever after. Unfortunately, real life doesn’t quite work that way.

Maintaining a healthy, happy relationship requires conscious and consistent effort. In much the same way that keeping your body in perfect condition forever is practically impossible, relationships naturally change and age over time.

The good news is that this process can be slowed down or even reversed. But doing so requires energy and specific relationship skills—unless you happen to be exceptionally compatible with your partner and belong to that small percentage of lucky couples whose relationships seem to thrive almost effortlessly.

For most of us, however, nobody ever taught us how to properly take care of a relationship.

As a result, couples can gradually move through different stages of emotional distance until the relationship eventually starts to feel empty. Sometimes this ultimately leads to a breakup, particularly if someone new appears in one partner’s life.

This gradual drifting apart is extremely common. The important thing is to recognize it before it takes you by surprise.

2. Poor Communication

Good communication is a skill—and unfortunately, it’s a skill very few of us are actually taught.

That’s one reason arguments in relationships are so common. Often, one or both partners simply don’t know how to communicate what is hurting them or what they would like to change without triggering a defensive reaction in the other person.

Consider a simple example:

“You never clean up the table after yourself.”

The accusatory tone means your partner may not hear the frustration behind your words or understand how tired you are of constantly having to remind them.

Instead, they hear an attack.

And when people feel attacked, they tend to become defensive.

Over time, this kind of hostility accumulates, and the emotional distance between partners grows.

Learning to talk about your feelings and needs without automatically triggering defensiveness in your partner is therefore one of the most valuable relationship skills you can develop—even if your partner does nothing to improve their own communication at first.

When you learn how to defuse attacks, reach agreements, and uncover what is really bothering your partner, the quality of your relationship can improve significantly.

Over time, your partner may even begin learning these communication habits from you.

3. Unresolved Conflicts

This isn’t simply about occasional arguments.

I’m talking about genuine, recurring differences between two people.

Maybe you love traveling and spending your free time away from home, while your partner would rather stay in.

Perhaps you believe parents should actively help their children with homework, while your partner takes a completely different approach.

The same applies to disagreements about money, household responsibilities, sex, parenting, or lifestyle choices.

If these conflicts are never properly resolved and there are no clear agreements between you, they can slowly tear the relationship apart from within. Resentment grows, hostility increases, and the emotional bond between you becomes weaker.

Conflict management, however, is another skill you can learn.

One particularly effective approach is the win-win method. Through effective communication, both partners work toward a solution that genuinely benefits both sides.

This goes beyond ordinary compromise, where both people often feel as though they have given something up.

The goal is to find a solution in which both partners feel that they have won.

4. An Imbalance in Commitment

This problem can work in either direction.

You may withdraw too much from the relationship while your partner continues trying to repair the connection between you. Eventually, that person may simply give up—and the relationship falls apart.

But you can also make the opposite mistake.

You can become overly accommodating, act desperately, and do absolutely everything you can to keep your partner from leaving.

In the long run, this can be just as destructive.

When someone sees that you will forgive absolutely everything and that you will always be available no matter how they behave, they may gradually lose respect for you—not necessarily on a conscious or logical level, but on a more emotional and instinctive one.

Restoring a healthy balance of commitment means giving your partner space rather than begging, chasing, or behaving desperately. When you stop doing all the work for the relationship, your partner has the opportunity to start investing more themselves.

One of the worst things you can do is disrupt this balance further by constantly criticizing your partner for not giving you enough time, attention, or commitment.

This imbalance is one of the most common reasons partners gradually drift apart.

5. The Loss of Friendship

Relationships that last a lifetime are not built on the intense infatuation we experience during the first few months of being together.

That intensity naturally fades. In fact, remaining in that heightened emotional state permanently would be exhausting—it can almost resemble an addiction.

The happiest long-term relationships are built on something deeper: friendship.

Alongside physical intimacy, successful couples tend to remain close friends. They enjoy each other’s company, take an interest in each other’s lives, and genuinely like spending time together.

Relationships often begin to fall apart when couples stop nurturing that friendship.

They stop spending meaningful time together. They stop doing new things. Eventually, they begin living next to each other rather than truly living with each other.

Everyday life becomes dominated by conversations about bills, household logistics, mortgages, chores, and responsibilities instead of genuine curiosity about each other and meaningful time spent together.

Maintaining this friendship is also a skill.

It takes effort, intention, and sometimes even planning. Unfortunately, many couples stop making that effort—which is why the gradual disappearance of friendship can become one of the strongest factors contributing to the breakdown of a relationship.

What About Infidelity?

Of course, these five reasons aren’t the only reasons relationships end.

I haven’t mentioned emotional or physical infidelity, for example, both of which can clearly contribute to a breakup.

However, it’s worth remembering that infidelity can sometimes be a consequence of problems that already existed in the relationship rather than an entirely separate cause.

If a relationship has stopped being fulfilling and an attractive new person appears, the temptation to cross boundaries may increase.

In a strong relationship built on friendship, mutual understanding, and emotional connection, that risk may be considerably lower.

What Can You Do Next?

There is a lot you can do to improve and protect your relationship.

If you’d like to learn more, visit https://relationshipinstitute.eu/. In the shop section, you’ll find courses on conflict management, effective communication, building a strong friendship with your partner, and creating healthier relationship dynamics.

I’ve been working in this field for many years, and the knowledge and techniques you’ll find there are designed to help you improve the quality of your relationship.

Robert Marchel
Institute of Relationship Psychology