I'm not going to help my disabled ex stepfather to get on through his depression.
Why don't you want to help him?
I'm tired of helping him all the time, he should stand on his own two feet.
I understand your perspective.  However, it sounds like he's going through a real tough time and I think it'd be good of you to help him out!  You never know when you might need help in return!
Nah, I'm going to be distant so that this doesn't happen again.
You need to have more compassion for other people. It's very important to help others in times of need.