An I overreacting?

My ex was abusive (not physically) and controlling. But we were both into things that most people aren’t so I feel like it’s scary to try to find someone else. So we have been having sex. Which has been fine. But today when we had sex it kind of freaked me out. Basically doing anal and started choking me. We’ve done both. I noticed that this time when he choked me, it seemed… different. Like he was applying more pressure to different spots on my neck and I could tell he was testing with his fingers where to push on more and was a little more aggressive. During this, he’s also going really rough and deep with anal. I tried to push on his hip to move him a little but he just moved my hand and ignored me. At one point, I did get a little scared that he was going to actually make me pass out. He’s choked me before but I don’t remember it being like this. Or maybe it just feels different now because I realized recently how terrible he was to me.

I feel like the only reason I got actually scared is because I’ve noticed that, even tho HE doesn’t want to get back together, he’s been weird about other guys. Like texted me and asked me if I was going on a date one day and then wouldn’t stop asking until I told him. there’s a guy we both know and he randomly started to call me a nickname so I nicknamed him back (it’s basically the first few letters of his name). My ex heard it and freaked out on me through text. Saying he’s a loser, how he’s told me multiple times not to be friendly with him. Or he told that he doesn’t want to see me with anyone else or that he doesn’t want me to move on. He does also say to do what makes me happy and stuff tho so that’s why I wonder