Hi, the longer he is alone the more apt he will some day work out these issues he has. In some ways being angry at the parents is the ultimate rebellion and young men at the age tend to rebell at most things. At that age they start to form their own opinions about things and often get carried away with this gift they have discovered. Sorry to mention this but it appears he does not respect you. Does he live with you?
Sadder, I can't tell specifically what the details are with your past, but it sounds like you left him when he was a child but now you want a relationship with him again?
Is it possible he has no guilt or feelings?
He has feelings. There is no doubt about it. Honestly though, you have to work even harder for those feelings. I know you care enough. You can't change the past, but work as hard as you can to change the future. Give everything you got. Because when hope goes, your relationship goes too. Stay persistent/yet give him his space. Have belief in yourself. Hope all works out!