After sex is always kind of empty for me, how can I feel not so alone?

As some other answers have mentioned, it's all down to how emotionally attracted the other person is. But do remember, when a guy is finished, he gets very tired and loses all his energy. Some guys will snuggle up afterwards and some guys will want to sit back and do something that doesn't take too much energy and doesn't feel clammed. Like playing a computer game or something.

So when you talked to him about this problem, what did he say?

It goes something like this: "Honey, the sex is great and I love ever minute of it but afterwards, I feel lonely and distant from you. Do you think we can cuddle? I understand that you don't like to but maybe we can find a comfortable position that suits both our needs?"

+ after an orgasm a guy feels like the last thing he wants to do is go at it again

Most likely you're with the wrong guy. I hated cuddling with girls I was just 'using' for sex; those that I really liked, I didn't mind at all cuddling with them after sex. If your guy doesn't want to cuddle with you, then most likely he is not that emotionally attached to you.

I think maybe the guy is not really attached to you emotionally as sexwiseman says.... a guy who does not like to cuddle or talk to you after sex is an asshole... I know some guys don't like to show emotions but when he really feels it, it's just natural. He would not even have to think about it, he would just do it. So I would guess he is just for the sex.