Most Helpful Guy
I never recommend anyone stay friends with their exes. Exes are exes for a reason. Its never good. most likely the guy wants to just for one last bang. It also isn't healthy for your future relationships. Seems you wouldn't be all in them as well as a single guy in the dating world it's not an attractive quality.
I know a little bit of what happened. Take a step back. How could you stay friends with how he treated you?