I think that you should just leave him be. If he broke up with you for someone else than move on. That is his mistake and he will see that he can't find anyone else like you. Just remember... NEVER BELITTLE YOURSELF!
well it's ok for a guy to break up with his girlfriend for a another girl but it's not ok for the girl to go out with a another guy while dating her boyfriend
well you can not unless you make the guy look bad
find another guy it wasnt meant to be
wait for the other guy to screw up then be her shoulder to cry on.
Break up with her she cheated on u
Ask her about the girl. If he is honest he will open up.
If the other guy won't back off, it's up to her.
He's not worth your trouble, move on and forget about him.
Wait until they break up, or find another guy.
No that is not true because they will use you up, so that they can get another women and do the same thing with that girl. Also if that guy is going out with you, then he will flirt with another girl while he is going out with you, right there in your face. So no it is not true if a guy wants you he will come to you.
It really is up to you. Personally I think you would be better off with a guy who doesn't make out with another girl as you deserve better.
I'll just give up on him and find someone better.