I'll try to keep the details pretty clean, but I'm sure you'll get the gist of what's happening. Still tagged NSFW just in case.

In a relationship with a guy who tells me all the time he wants to see me do X thing with other guys. We have guys over a couple of times. X thing happens. Smooth sailing, and we all love it.

He tells me a few times he wants to see me do Y thing with other guys. I find a guy interested in doing Y thing to me, and tell my BF. The reality of it hits me, so I start thinking of the practical side of things. My BF's place is kind of small, especially the bathroom (which is where Y thing would happen). I already feel cramped whenever I'm in the bathroom by myself. So I get to thinking it would be more comfortable and fun for everyone if we had more room, and I suggest to my BF that if the other guy is willing, we should do Y thing at his place instead.

That one suggestion is what he suddenly takes issue with even though the rest of it was all his own idea. Now he's broken up with me and I have to get my stuff out of his place next week, all because I suggested we do the thing he wanted me to do at someone else's house because I thought his bathroom was too small for all 3 of us.

At first he wouldn't even open up to me on why it mattered and why he was freaking out (saying I crossed a line, it was over, insulting me, etc.). The next day he finally says it's about a power thing for him. He's the king of his castle and if he's at someone else's house for it, then it's emasculating for him. I'm happy to hear an actual reason behind why he's acting like this even if I think the location shouldn't make a difference for that. The thing is, I'm totally fine with not doing it at the other guy's place, and I'm fine with not doing it at all. The problem is my BF didn't stop there. He's still treating it like I've totally messed up, saying that because I want it to be at the other guy's place instead of our own, that I'm going to start cheating on him with this other guy by going to his place all the time without my BF, and that it's still over between us because I even thought this would be okay. He insults me more, says he doesn't even trust me now, tells me to go have fun with the other guy and hangs up while I'm trying to tell him I've barely even talked to this guy, don't care about this guy, and am only talking to this guy because my BF wanted me to find guys for Y thing in the first place.

To summarize, he wanted to spice things up, then accused me of potentially cheating on him in the future and broke up with me.

AITAH?