My LTR is a decent girl, n=0 (apparently), submissive, etc. One thing bugs me. Apparently she's been hanging out with the same circle of 5 friends from her hometown since 1st grade or some shit. One of these is a dude, we'll call him Mark. She does all kinds of things with these friends, including camping (all staying in the same tent), visits to Mark's grandparents', backyard drinking, etc etc. Normally when she hangs out with Mark, there are other girls in her friend group there, though they snapchat occasionally.

Is this an issue? Meaning, should I permit this? Is she trying to pull a fast one over me?

Every time it (the LTR) mentions this Mark fellow I repeatedly demean him by making jokes insinuating he is gay, etc. I think it's funny, but is this making me look like a beta?