My bestfriend’s fiancé

Warning: I describe some situations that may not be particularly comfortable to read (and in some detail so you can get an accurate picture of what’s happened) so I just wanted to warn. Please be mindful.

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I‘m kind of at a loss and I need some help figuring out what happened. Back in college (about 6 years ago) I had a very close friend group. It was me, another girl, and then another girl and her fiancé (now husband). We were all very close and incredibly comfortable with one another. I mean close enough that the girl in the couple would compliment me and the other single girl’s body and then follow it up with “hun, don’t they look really good in that outfit?” I’m someone who had never gotten a lot of attention from guys so I don’t always know how to tell if someone is being nice or is interested in me. Basically one night all of us are partying at the couple’s house. We all get very intoxicated and play strip poker (why? I still ask myself that tbh). Me and the other single girl plus the fiance end up naked and the girl in the couple is in her underwear. We finish and are all sitting on the couch which is kind of small. The guy ends up next to me with his wife on the other side of him. He puts his arms around both of our shoulders and he’s rubbing my opposite shoulder and kind of grazing my breast as he does it. I don’t think much of it, being both drunk and assuming he doesn’t notice. I get up and use the restroom and when I come back the single girl has been picked up and the wife went to bed. He stops me and asks me if I was okay with what he was doing. Maybe I’m either incredibly stupid or naive but I assume he means the shoulder rub and I was fine with it. To me it was no different than literally any of my other friends doing it. So I say it’s fine. We then sit back on the couch where I will be sleeping since I’m too drunk to drive and he sits with me to watch TV. at some point he gets closer to me and starts full on groping my breasts. I don’t really know how to respond so I just kind of lay there and just stare at the wall. He grabs my hand and started using it. and I mean using because he’s literally having to hold my hand and move it like I’m a mannequin. Also important to later but he continues to touch me with his other hand to try and get me off. Finally he finishes and he goes to the kitchen and literally drops a paper towel on my chest and walks off. Now keep in mind he’s literally not said anything since I very first came back from the restroom. I curl up and sleep the alcohol off and leave first thing in the morning to shower. I for the next several years treat it as me and him sleeping together and me helping him cheat on his wife. Fast forward to 2024 and me and him have still never talked about it. We don’t really talk much at group hangouts and I make it a point to never be alone with him( especially where alcohol is involved). Me and his wife are incredibly close and literally hangout most days together. Therefore because of how often I’m at her house with her, I start seeing more of him. Me being a nice person, I try to chat and basically act like nothing happened and that we are still good friends. This basically continues until mid 2025. Now we are to the point where I’m feeling comfortable not only drinking around him again but hanging out more like we used to (me and him without his wife being right beside us). Well he starts kind of leaning on me and resting his hand around my shoulder at a hangout. I try not to think much of it and leave it alone. Well he starts gradually increasing. We move from leaning against me to resting his hand on my thigh to stroking my thigh to full on rubbing my breasts and putting his hand down my (very tight waisted so it took some effort) jeans and resting his hand in my underwear and has even gotten to the point where he was briefly rubbing my genitals. During each of these encounters I’ve not said anything but I’ve moved around on the couch to get further away and put pillows between us and leaned away as he’s tried to touch me. Literally everything short of verbally saying stop. And I want to. I’ve tried and I can’t make words come out when I try to speak. It’s to the point that after a bit of trying to escape it lean away, I just carry on normal conversations and basically act like it isn’t happening because he doesn’t seem to care to stop what he’s doing.
All of this to say I feel insane. Part of me wants to say it’s assault and that he’s in the wrong. Part of me is still hung up on the initial feeling of I helped him cheat and says it’s all my fault and that I’m just freaking out because of that. it feels like I’m trying to assuage my own guilt in this.
So I want outsiders opinions. Am I freaking out over something justified or am I’m being very overdramatic?