Do I tell him?

I started seeing the sky back in September of last year and we were pretty good until this summer when we started to fight so we were on and off a lot in between fighting and when we were off I just hung out with my friends went to the bars and I did end up having quite a few hookups and I just don’t know if I should tell him or just take it to my grave. We are getting back together now and working on our relationship to become happier and healthier and I never had any feelings for any of them. I feel if I do tell him it would just ruin everything and end our relationship.

No we were not together. We were broken up.