<human>: I'd like to think I'm pretty reasonable. I don't look at my man's phone or email, unless he asks me (he's a bit of a Luddite). I'm cool when he wants to spend time away from me. I'm no pushover, I make it clear my boundaries. Felt like everything was cool up until tonight.

Anyway, his friends (older) invited us over for dinner tonight. Cool, down with that. Their granddaughter is there. At times, he brings up them wrestling when she was younger. It gets to a point where I don't think it's funny, but not offended, just weirded out. What would a 16F see in a 39M? I already know what a 39M sees in a 16F, but she's pretty awkward, not really mature or sexually mature. There wasn't anyone else at dinner that I felt she could have been enamored with, so fairly certain of the vibe that she's keen.

We left the dinner party at a suitable hour, no issues, I thought he might stay at my place but he has an early start. Truth be told, by that stage, I wasn't interested in spending the night with him. I just said I was pissed and wanted to be alone etc.

I guess if I'm honest, I don't want to be talking about babies (or trying for babies) with someone who's easily led astray. I'm 31F. I'm not short of time, but I don't want to waste time with fools.

I guess I also thought a man who had been burnt 10 years ago, would appreciate a woman like me. I make it known that he's my guy. Brush off any advances etc.

I get that people develop crushes. And maybe it's nothing, just harmless. But a pit developed in my stomach. I could already be pregnant. I actually hoped I wasn't, because I felt such pure disgust at the situation rising up.

Please tell me I'm wrong. Not sure what to think.

Can you condense the text into three sentences or less?
<bot>: I (31F) think my SO (39M) has a thing for a friend's granddaughter (16F). Played it down, but my gut says otherwise.