Well... I guess he’ll soon be your ex boyfriend. Though I suppose it’s possible that it’s platonic. Depends on how you found out. Did he tell you or did you stumble across something?

I hope you mean EX-shitty situation! Oops, mixed up my comment clichés! That sucks. Aw, I’m sorry.

The explicit mention of the hotel suggests there's more to it than catching up...

I mean yes - not knowing all the details - it does sound dodgy, ex-girlfriend, meeting in a hotel etc., but I mean it has been 7 years! I've definitely got some guys who I don't think I'll ever be completely indifferent about even if I met them after a decade, but then there's some who I've just been good mates and it's ended amicably and I don't really see a reason why you'd have to throw that completely out of the window. Of course be vary of it - that good friendship is probably what lead to romance -, but most likely, especially if he told you about it himself, they somehow ended up on each other's radar after years and were curious of how the other was doing and the conversation just carried on as it would do with friends. It's definitely not grounds for immediate break up!

Dump him immediately. At the very least, he has been having an emotional affair with his ex. He has also shown that he has every intention of making it a physical affair. Don't give him the, "if you go we're through" ultimatum. Just leave. You don't need to argue with him, or convince him that what he's done is wrong, or get his approval to leave. Just leave.

"He didn't say no.". That heavily implies he didn't answer "yes" either...

Time to hack his butt plug

Lol how would they be "friends" if they booked a hotel together?