I've been talking to a guy and I asked him how he feels about a partner hanging out one-on-one with a male friend. (I have a few guy friends and I've grabbed food with them alone, even the ones in a relationship, and it was never a big deal. I always thought people who had issues with stuff like this were insecure). He said he wouldn't like it and I asked him some questions about it. He's not sure if that's a dealbreaker and I was like "but what if they've never had any sort of history/feelings and they've always been good friends" and he said that it's still a boundary for him because "what if he tried kissing her" or something. He said he doesn't want to deal with the aftermath of that, even if the girl had no feelings.
I personally think it's only an issue if the girl knows someone likes her and still hangs out with them after that, but he said "what if she doesn't know though". I guess? I also asked him how he'd feel if the guy friend was gay (2 of my guy friends are gay) and he initially wasn't for that either but sorta warmed up to it more than hanging out alone with a straight male friend. I'm not sure if I should keep talking to him and see how it goes. I mean, what, I'm supposed to just tell my guy friends "hey I can't get dinner anymore" if I ever go official with this guy?? Is this a normal boundary for people to have?