I'm not going to help my co-worker
Why don't you want to help him?
He'll be in trouble if he can't fix the situation.
Relationship with co-workers can be difficult but you should try to have a good relationship with them. You will have to work together and someday you might need help too, so helping them now might be good.
So if I don't like my co-worker that means I should help them? I don't feel I need to help them.
I think that if you help them, you will be much better recognized and it will help your career. Not helping them makes you look bad.