Ok, I think you have the answers to your questions in your mind already, otherwise you wouldn't be questioning things.
Everyone in life does things that they think will help themselves, even if they go against our morals and our common sense. We are but human and we do require a certain amount of human contact....sex is certainly one of those things.
It's pretty obvious that this guy is a user. He has figured out how to bed women who are gaga over his looks, and even those who are vulnerable and feel that they could never get a good looking guy like him. He is shallow. He will not commit. He will probably not even give you a straight, honest answer if you should question him.
At this point, if I were you, I would pick myself up, dust myself off and realize that people make mistakes and it's time to move on. Please know that you are not the first one to go through something like this, nor will you be the last. Don't beat yourself up over this....that will accomplish nothing but make you feel worse than you already do. In the meantime, maybe you can work on yourself esteem....start taking better care of the inner you so that the outer you will shine through and attract someone of substance that you can have a real relationship with. You deserve to be taken care of....and it all starts within YOU!
Be well.....and smile....life goes on and lessons are learned

sabby