It's hard to answer for a bunch of different reasons. Guys always try to appear the same way when it comes to feelings but the way we feel from things can really differ. I think most guys try to convince themselves that they dont feel anything so their not lying to you , but rather themselves.
I know that me personally, I have broken up with girls, not felt anything for 2 weeks, and then BAM I felt like life was over for like, 2 months! haha But I have seen a lot of guys who really seemed to think that they weren't bothered by their break up who definitely were.
People don't understand it, but one of the hardest things to do in life is be honest with yourself.
Doubtfully! But the question is what feelings does he have. He could have pure loathing for her! Example: I still live the woman I married 9yrs ago, but wanted nothing to due with the lying cheating manipulative B**** she became when I divorced her. Our feelings make us who we are. He's with you. Isn't that enough?
It depends how long he hasn't been with her for whether he stayed away from her before getting with someone else because if he was single for a long time and never tried to get back with a girl he was previously with then I think he's moved on if he still talks about her and there was only a short time between him leaving her and getting someone else then he may be with someone else to make her jealous or to make her unhappy. If stuff she does matters to him then that's a safe bet that he still think about her a lot