In life we do everything to be happy. Most of the time we are not aware that we control things for us not to get upset. In a relationship, we hold on to it especially if we know it is worth fighting for, but life is a battle. It is not all the time that you win or you lose. What matter are the lessons you've learned and what you have become after those struggles.
P.S. This is my fourth long exam in Math1 that's why there are some math concepts but I'm sure you won't get bored. :))