I pretty much live by this quote. Went through a break up. This got me through a lot though. Learn to accept things the way they are, some things you just can't change no matter how bad you want to. Everything happens for a reason.
"The true mark of maturity is when somebody hurts you and you try to understand their situation instead of trying to hurt them back." // (I don't want to label what "the true mark of maturity" is, but this idea of empathy vs revenge is important to me.