Why does him wanting to have sex trump you wanting to have sex? Especially when you arranged everything.

Why was the conversation not "Hey, I also arranged a date on the same day as yours. I assume you'll be using the bedroom later? Just asking because if not, I'd like to use it"

Why was it assumed that he gets priority? Why does he get priority when you arranged it? Why does he get priority when you made it clear you needed the bedroom before he even planned his date?

Why did he at no point think to ask you if you're okay with it?

You both live there. It's shared space. You both have equal claim over who gets to use it and need to arrange it between yourselves, fairly.

This is absolutely unacceptable and to be honest sounds like manipulation. Like he feels jealous or doesn't want you to fuck other people so he sabotages your other relationships. But maybe I'm just hypersensitive to that.

Suggestions for next time: He can piss off, he can fuck in the guest bedroom while you're fucking in yours, he can get a hotel room, he can fuck at his partner's place. But most importantly he can piss off when sabotaging your plans.