Please take the time to read this. its about a guy.?

I think it is just jealousy. You are probably just shocked at the idea of someone else being with him. Or, it could be that you had tagged him in your mind as "yours" so now that he has someone else, you are temporarily feeling like you want him. It will go away. You were just fine and then you found out someone else had him.....just jealousy....you will be just fine with it in a while.