BUT WHY DO RELATIONSHIPS FAIL??
I like to compare relationships to running your own business. They require planning, your time, dedication, faith and passion. It is not as easy as it looks to maintain a good healthy relationship.
Here are a few things that could lead to break-ups, not in order of importance though.
Burnout - Although many can carry out romance throughout their entire relationships, the actual honeymoon phase does have to end at some point, in reality. Every relationship has its ups and downs. During the "down", if one partner seems trapped, tired, helpless, depressed or let down, and does not seek to solve this problem with the other party, things can only go downhill from there. And those who can keep the "love" fires burning, not 24 / 7 but off and on regularly during their relationship, have better chances of a happier relationship than those who suffer burnout and don't know where to turn or how to solve their problems.
Pressure - When one partner puts pressure on the other partner for whatever reason, this partner could possibly end up feel like they are not good enough no matter how much they try, and ultimately not want to be in a relationship. Nobody wants to feel like a failure, small or unappreciated. This applies to both the man and woman.
Forgiveness - No one is perfect. Mistakes are a part of life. Those unwilling or unable to forgive can pretty much count on having more unhappy relationships over time. Relationships based or growing on anger, spite, disgust, resentment or other negative feelings associated with lack of forgiveness are like a ticking-time-bomb.
Just the fact that you are willing to work out things is enough to heal a broken heart and can bring healing back to your relationship quickly. Good luck