For a person to up and just leave a relationship like that they had other plans,plans they thought were better,and they found out what they had was where they should of stayed.Dude just trying to come back to her because obviously she loves him and the grass wasn't greener.Notice the tiny pity parties he wrote.Also if he cared that much he would of tried to work on things not leave.If he feels this way now it's because something he thought was better was not.I think OP should find her a real man,someone who communicates from the start,not just runs off.Obviously she loves hard and needs someone who loves her just as hard and communicates before ending things,not after he goes out and plays a little bit.