Solo vacation? Unless he’s going fishing with his guy friends - then he’s having an affair. Is it really solo, or with friends but not his wife?
As for the dating - there was a time in my twenties when I really wanted to be in a new relationship. I’d come out of an unsatisfactory relationship, and just really wanted a new, “normal” relationship. I’d just started medical school and was surrounded by eligible guys. But the ones I liked could feel my neediness and weren’t interested. In fact my next (brief) boyfriend did come when I wasn’t expecting him. (The guitarist in a popular local band that my roommate and I used to go see sought me out - could have knocked me over with a feather).
Bottom line is - confidence is attractive. And guys are more likely to be interested if they have to work for it a bit.