FWB acting strange. How do I go about this?

My close friend turned FWB of almost 3 years has been acting insane. For some reason, for all this time, he has been intimate only with me which I didn’t question.

Recently, we’ve been sticking to video call sex cuz we’re long distance as he moved to a different country and ever since, he’s been saying crazy things like “your future husband is really lucky..he’ll get to have sex with you every day”, “tell me you love me and miss me”. And the craziest one, “can we still be intimate even when you’re married one day” and I shut that down and asked him what if he’s married and he said he doesn’t care about his marriage, he’d still be intimate with me.

To this add all the nice compliments and fixation on my face. The one thing I do appreciate is that he’s so much sweeter now, in general. So yeah,this is new and I’m not sure what to think or do about this. Mind you we’re still good friends regardless of the intimacy so I wanna go about this in a way where I can save the friendship.