I think it's great that your daughter is doing well! That's really what it's all about. As a parent you can take anything thrown at you as long as your children are ok.
To Don's point I went out on a couple dates last week with a woman who waited 14 years after D to start dating again.
I've mentioned a few times that my best friend hasn't dated in 15 years and he is one of the happiest people I know. He focuses on his career, kids and hobbies. I asked him about it the other day and he said I have had two relationships and neither of them was very fun for me lol.
I know OLD can be rough but it really is the best way to go out on dates. I had my first flat out no show on Sunday. No text, no I'm sorry, radio silence.
As for the other guy my guess is it was a temp check and you will be hearing from him again soon.