My life is miserable when my step-son is involved.
Why is it miserable when your stepson is involved?
My wife left me, she took my son with her.
That is your real son, right? I'm sorry you can't see them anymore, but you have a new family now. It would be best to try and get along with your step-son for his sake and your new wife's sake. Maybe you can keep contact with your real son online.
I guess, he is in my life now and I can't back away. But I still don't like him as he is.
I understand this is an upsetting situation for you. I feel the best thing to do is make it known that you want to be there for the child. Things may change later for you down the line.