My rule....get in the fetal position, mourn the loss, get up & move on! I'm not saying that I won't get hurt nor am I saying that I haven't been hurt BUT I refuse to be held as an emotional hostage. Having a broken heart is seldom fatal. I don't mean to come across as bitter, it's just that I don't think you can "make" someone love you.
Disrespecting yourself as well. Let them know they hurt you, and that it won't stop you from keeping on keeping on.
It's a vicious circle