Right to be jealous?

I’ll try to keep it short. It’s not really that big deal but just happened and have me very upset.

A little bit backstory:

We’ve been together for 4 years and a half. We’ve been our firsts, just finished college and although no serious facts, we’ve been talking about our future together, like the wedding concept, kids concept.

In bed we’ve always been into kinky stuff, bdsm mostly. I know he likes to be dominated but usually we do the opposite, as it’s easier.

So today he told me about this friend that has been into a bdsm bar. Besides fancy named drink there were special services, not explicit. Like some waiter/waitress ties you up in a chair and play with ice with you. I said a bar like that sounded awesome, but men only should do things to him, and only women to me.

He looked at me puzzle, asking why.

And now I can’t take it out of my mind!!! Why?? Because I’m not watching you getting a massive boner from a hot af dominatrix playing with you. And I’m not doing it afterwards so you can get off thinking about that other woman you just called mistress.

From his point of view, doesn’t he care to watch another man tying me up?

This might be nonsense, but really, I’m very upset, and hurted and angry right now. Am I exaggerating? Please someone tell me I’m not crazy, or why what he says is harmless