More often than not, a happy life has to do with the quality of your relationship with your sweetheart.

With so much work that is put in to them, relationships are difficult to lose. So the question is, why do some relationships fail?

Let's take a look at these 7 reasons:

1. Not putting your relationship first

Society doesn't teach us to value our relationships or about the daily commitment that healthy relationships require. Sometimes our careers and our kids take the lead and our relationships come third, fourth, or even tenth on the list of obligations.

Relationships take quality time and commitment. For example, if you stop having sex, the desire to will completely fade, or if you stop talking about your hopes and dreams with your spouse, you will grow further apart.

Just like with most things in life, you receive what you give.

2. You seek external validation

Sometimes people are not comfortable with who they are and they end up looking for validation through a significant other. When your sense of self is constantly unstable, you look for validation elsewhere.

When you don't have a clear sense of who you are or what you want in life, you will forever keep trying to mold yourself to become what you think other people want to be. Relationships are about loving and accepting one another as you truly are.

3. Low self-esteem

For both partners to feel valued and secure in a relationship, they both need to have self-esteem and feel secure with who they are. When a person has low self-esteem, they depend on a relationship for security, which can backfire and lead to doubt. Having confidence in yourself and in your significant other is the healthiest thing you can do for your relationship.

4. Infidelity

This one is obvious...

5. Controlling behavior

If both partners in a relationship are not equal, it can cause conflict. However, it's not as clear-cut and may take some time to manifest in the relationship.

Controlling behavior can fall under the desire or need to control one another's finances, needing the other's permission to do something or making decisions without consulting each other first.

6. Narcissism

There is no room for selfish behavior in a relationship. Narcissist's only look out for their personal interests and don't care about their spouse's day-to-day life.

This, in turn, can build resentment as the selfish individual constantly uses charm and manipulation to get what they want.

Relationships are partnerships, which means they are based on compassion and compromise. If one half of the relationship refuses to compromise and leaves the other person out, things will not end well.

7. Money

Money by itself isn't going to break up a relationship, but how both of you manage it will. Couples who fight over their finances and degrade one another on how their expenses are used are setting their relationships up for failure. If one partner blames the other for debts or for not pulling their weight, anger, blame and resentment can start to settle in.

Relationships are complicated, but they also evolve. Sure, all these 7 reasons by can bring a relationship to a end, but at the same time they can also be avoided with awareness and a desire to do better.