If he left me, there is a reason but he might not want to tell me why he's leaving. More then likely he's bored with me, tired of me, can't stand the site of me or not ready to settle down.
That being said, I wouldn't go back to him because he would probably do it again.
Fool me once, shame on you. Fool me twice, shame on me.
I can tell you that sometimes it works and sometimes it sends you south when you want to go north. Trust me, it sent me about two hours out of the way at night
RE: Would you consider going back to someone who hurt you?
If I were going to leave someone, I would tell him why I was leaving.Even when I met someone for the first time, just for a coffee date, I told him that we weren't a good match or something to that effect.
When you leave someone, you hurt them. I think if they know why you are leaving it's easier for them to accept it.
You see, even in the breakup stage, I wouldn't try to hurt him.
My conscience would need to know I left him with consideration of his feelings.