Wow, that's a tough one. I wouldn't feel bad about having these feelings. When you Love someone, I think it's very hard to get overthem completely, especially when they leave you and not vice versa. Just remember the jackass he was when he left. And don't let this recent guy get in the way either. Keep looking for Mr. Right and when you find him, all those feelings will become a distant memory. I still have feelings for my first love. When she dumped me, the only way I moved on was because I found a replacement who was a lot better for me. Well, at least I thought so until this summer when she left. Don't let it bother you that you're depressed. Embrace the feeling and move on tomorrow. Don't bottle things up.
I know it may be difficult to see him again, but I always think it's a good thing for a child to know both their parents.
"Oh Lord it's hard to be humble, when you're perfect in every way. I can't wait to look in the mirror, cause I get better loking each day. To know me is to love me, I must be a hell of a man. Oh Lord it's hard to be humble, but I'm doing the best that I can." Mac Davis