I didn't had the feeling that they are dating or that the GM has a crush on F. In this case the NPCs would try to flirt with F, compliment him for his beauty, and so on. That didn't happen. But I'm also pretty sure the other campaign had exactly the same issues.
That's difficult. My only contact in this group was the GM, but I already deleted his number from my phone. I don't know how to contact the other players. But don't worry about me, I still have my regular (and much better) gaming group!