I remember someone saying that after a break-up you should give yourself one day to eat everything you want, cry all day, and watch sad movies. Let it all out. After that, don't let yourself feel bad for what is in the past. Mourn it, and get it over with. You will meet someone else that will make you happy. What you cannot do is to make up all the time you spend being miserable for what happened in the past. I am not saying it is easy. But, you owe it to yourself to be happy.
