One thing i know, break up is the last thing a loving couple want in their relationship. There's no more late night call until fall asleep, no good morning text, etc. All of those happy moment suddenly fade away, replaced by never ending tears and bitterness. As what most people do; first, we try to think why we break up and blame ourselves. Second, we start thinking about if only. "If only i were more patient; I should have fought more" etc.
In the end we'll realize that's not the point. The point is, sometimes thing just does not work out. No matter how hard we fight. No matter how much energy we give in trying to fix this, it is a thing which we cannot determine. It is beyond our power. It is His. He's the one who makes the plan for us.
The question is, Why too much thinking on something we cannot even give impact to? Why we keep crying on spilled milk? Why keep holding onto the pain?