Are two guys not meant to be together?

I've been hearing this said from not straight people but biual guys. I have this friend that's (30) married with kids..and he talks/thinks if two guys are not meant to be together which reason all gay guys cheat and what not....He also say there's no such thing as a "straight guy" because all straight guys will have with another guy if they find the right one....so basically he thinks there's no such thing as straight and everyone is .....he use to be in the gay o industry...which I think is the reason he has such generalizations of all the gay/bi guys he's dated/messed with in the o industry....I really don't think he mess with other guys outside of that world and think all guys are like that (promiscuous)