If a friend used to treat you badly...

If you had a friend who used to sometimes treat you badly a couple of years ago, would you distance yourself from that person, or believe that they have changed and continue the friendship?

I believe that people don’t really change that much, so if someone used to treat me badly a year or so ago, they are just as capable of doing it again.

I have a friend who I’m quite distant to, but two years ago we were a lot closer, and they used to be kinda mean to me, like talking badly about me and other people behind my and their back and jokingly but not actually jokingly insulting me. Dunno if I should continue pursuing the friendship because I’ve made this mistake quite a lot in the past where I’ve believed someone has changed but they haven’t.