Insecure about my partners new sexual partner and their “rough” sex

I recently had a bit of an insecure moment with my casual partner. We’ve been seeing each other for a few months and just recently he has gotten himself a new sexual partner. I got incredibly jealous by this as he was seeing her quite a bit and blowing off hanging with myself so I started asking questions about their sex. Kind of like when you get cheated on and you need to know every detail but also don’t actually want to know. So I asked him if enjoys having sex with her more and if the sex is better. He said the sex is very different and I asked how so? He said it’s rough. I replied saying that we also have rough sex. He paused and said “I don’t know how to put this but I actually like you”. He was covered in bruises from this girl biting him and says she’s a “brat”. He said I was too nice to be bratty. After this conversation, we later had sex that night but I couldn’t get out of my head and enjoy it as I was so concerned with our sex seeming boring to him. We have rough sex but it’s more firm and sensual (I don’t bite haha). I’ve now been feeling rather sexually insecure and wondering if anyone has any opinions, similar experiences or advice? Thanks xx