Ex issues help !!

So I broke up with my bf months ago and we never spoke to recently and I swore I'd never go back because he filmed himself kissing a girl in a hotel apparently we were on a 'break' after this u just hated him but now i feel feelings coming back and I don't know what to do he was a great living funny guy but after that I felt crushed and I just don't wanna be dumb and go back