I've namechanged because there's going to be some detail and I fear it will be long, sorry.
I've known a man for a really long time. We've always had a very mild flirtation after a drink, but I was married and he's a divorced man who gets through a lot of girlfriends.
He has a very attractive much younger female "friend" and whilst I believe she only sees it as friendship (she's young enough to still want children, he has three adult children), I'm sure he'd jump at the chance for more. When she is at an event he barely talks to anyone else and he's quite handsy with her, which she doesn't seem to mind.
I know she has been at least part of the problem in many of his relationships. He is very clear that anyone who is with him will have to accept this friendship, which is obviously very important to him, but I can see that it would be very difficult for any woman to deal with.
Anyway, I've been at two events with him this weekend. The first she was there, I had fun with the group, but very little to do with him, as he was otherwise occupied.
The second she wasn't there, we had a really fun afternoon with the group, then went on to party into the evening, just the two of us. Nothing "happened" but we would have absolutely looked like a couple, in fact some strangers told us what a nice couple we made. I suspect we stood out because we were having more fun than couples often do mind.
He was very well behaved, but he held my hand all the way to the train (we're far too old for that, but had been drinking, slowly, all day by this point). We were nicely sozzled, but not incapable. Then we said a quick goodbye and that was that. He asked me to let him know I was safely home, which I did and he replied thanks for great day etc. I haven't heard from him since and don't expect to, until the next time we're out in a group.
So he's a fun friend with occasional sexual tension which isn't going anywhere. That's fine with me, I'm not getting in the middle of the thing with the younger friend and TBH although we have fun at a party together, I'm not sure there's anything there to give any relationship much substance. I'm not looking for "someone", just to enjoy life for a bit.
However, I do also feel a bit used in that if younger friend is available, I'm not needed/wanted at all, the same way I'd feel if a female friend was only interested if they didn't have a better offer iyswim
Step away altogether or enjoy it when it happens?