If this is really bothering you why dont you go and ask him that question. Is it possible that he could be using you for sex and because you didnt give yourself up he went to the next best thing? Dont let him bother you... honestly hes not worth it. If he really did like you then he would have said no to whoever he slept with. Also ask yourself does he know that you know that he likes you?
It means that he wants to sleep with you and see how good you are in bed having sex with him and then if he likes it, he would concider staying with you, but if the sex is bad, hes moving on to someone else.
try to act cool with him or u could do anything he likes.
Leave him alone and back off. He likes someone else.
If someone likes you they will spend time with you, laugh at your jokes, smile with you, talk to you, look at you when they could be doing something else. It doesn't matter who you are, you can always tell if someone likes you.
When he has a penis.
Have someone else do it for you.
* If you are legally separated then no, you are not cheating by sleeping with someone else, but remember ... she could be doing the same thing.
tell them to get over you and date someone else.
It means he wants someone else but is flirting with you as a second resort if the person he likes doesnt like him back
Yes, a man could have someone else.
Ask her.
Move on