Body count

So, my ex of 4 yrs and I broke up a couple months ago. I was hurt even though I’m the one who ended it. (He was mentally and emotionally abusive, controlling and manipulative). He was on drugs at the time. He’s clean now. A lot of shit has changed in the last couple months and he’s noticeably improving. We have a child together so we still talk and see eachother for means of coparenting but we also hangout all three of us once a week. We go to the park or the movies so our son can see us get along. It’s going really really well. We’re discussing the idea of trying again. Slowly this time (we moved fast the first time around). He keeps insisting that he didn’t hookup with anyone while we were broken up. But I don’t care if he did because we weren’t together and I hooked up a lot while we weren’t together. He was the first person I had ever been with, and the only for a long time. Now my body count is 9.

Here’s the question, do I tell him? Or just never mention it? He makes comments about it but never straight up asks and I don’t know if he wants to know for sure or not.