Guys, how would you feel if your girlfriend had a male best friend who was straight?

Gotta have some trust in a relationship.

well, i lost my GF to her ex who she claimed was just a friend, so.... yeah id totally trust her, as im poly, and id foster an idea of open-ness with her to tell me if they caught feels and wanted to sax it up

I appreciate and wellcome good friends.
Of course as long as it fiercely keeps my (both) standards for friendship.
What means not even the shadow of flirting, no banter, no 2nd meaning jokes.
I woldn´t get in nor stay whith someone with orbiters.
Loyal friends of any gender are a blessing anyhow.

I’d be suspicious !

Not as long as I could remain as another best friend. Speaking from experience!

If I didn't feel like I could trust a GF, It would be time to break up.

Not really. One of my good friends is female. So yeah

Naw. I’m not a jealous person

No it does not bother me

I don't know about "best" friend, but we're allowed to have opposite-sex friends. It doesn't bother me.