25m fwb and my 26f suspicion of his jealousy

So I have this fwb 25m that I’ll call John here. We’ve been seeing each other as fwb with a pretty solid connection for about 6 months. Overall he’s a very nice caring sweet guy. We get along great on dates and hanging out with friends etc.

Together we’ve been exploring a breeding kink roleplay type thing. It started off a while ago pretty normal and standard with all the normal talk of getting me pregnant etc. Anyway last week we were doing it and I think he changed the dynamic of the roleplay and might have hinted at possible jealousy.

He started talking about getting me pregnant while doing me but then started talking about how much my body would be “destroyed” (his word) by his children with “a stretched out vagina, stretch marks, scars, etc” and that “everyone would know that I belong to him forever” and that “those marks/scars would be his mark on me”.

So I say inside my head yikes. I lose the mood and felt kind of concerned but finish with him and leave. I’m not afraid of kinks at all but I felt like he was trying to tell me something like he was projecting his internal jealousy (he’s not the only fwb).

Looking back on it maybe it’s kind of hot but I guess I’m concerned about his possible jealousy issue because I have a strict stance on handling jealousy with partners – I try and avoid it. He’s never seemed jealous about our circumstances so far and I was wondering whether this is a sign of jealousy. The weird thing is he never texted me back too after I said that was fun. We talk about every other day and see each other every week pretty much. What does reddit think? Is there something more to this guy’s feelings? Is this standard play?

Tldr 25m fwb is possibly projecting jealousy to me 26f without actually talking to me about it?