I'm going to refuse to pay money back that I owe my ex bf.
Why do you now want to pay back the money you owe?
I hate the fact I have to pay him back for stuff he's no longer willing to pay for.
You seem to think your ex is still responsible to pay for your things. He is a free man now, let him go. Pay for your own things.
But he always helped me pay for things when we were together.
It was reasonable for him to help you out when you were together, but now that you're broken up I can understand why he doesn't want to pay for your things. I think you should pay him the money you owe him and stop relying on him.