I have no reason to be worried about him cheating (or trying to, she'd have to reciprocate), but I suspect DH has a thing for a younger woman who's an acquaintance. She's a woman who lives locally, goes to our gym and occasionally one of our local pubs. We see her once every month or so, sometimes he's seen her own (he'll briefly mention it).
We've been married since we were 20 (now 50).
Although DH doesn't say much about this woman, I've seen how he looks at her. He literally stares a hole through her like he's transfixed. She must notice. Others might have noticed. He is always fascinated by what she's saying as has lots of questions. And ridiculous jokes or stories. Although he can be talkative with anyone, he doesn't act that interested.
You can't miss it, and I had a go at him about last time, and said, "anyone would think you fancy her....she's young enough to be your daughter! You've embarrassed me but yourself more". DH just said, "no I don't she's so young....she's so young she doesn't know what X is and who Y is, etc".
The next time we saw her in the gym, DH starts peppering every other sentence with, "aww, you're so young you don't know what Seinfield is", or something like that. He also made a point of mentioning, "we live in London now, and I love it, and so does [my name], which is lucky."
It just seems so conspicuous. Do you think it's embarrassing? Why doesn't he just admit he has a thing for her (I think he probably does)?