DID I GET USED?

So I ruined my ex's car last year...he got a new one but then that one too a shxt...so I offered him money to get it fixed because he does have two kids and it's getting cold...so I give him money right...and he doesn't use it to fix his car. Whole time I think that it's getting fixed. Just for him to ask me for more money, he was honest about not using the money for his car said he paid bills...which he lives in a homeless shelter and doesn't have a job so what "bills" he paid makes no sense to me. Anyways I tell him no because I feel that's using me and HE HAD THE NERVE TO GET MAD AT ME! Edit: I gave him the money and we never spoke about it again. But then a week later he asked me for more money to fix his car which I thought he did in the first place...I'm not in a relationship with him nor do i want to be. I thought I was doing the right thing by paying him back. But I felt like he was trying to take advantage of me.