Basically, just started to LTR a girl who has just recently opened up to me that she is bisexual, this wouldn't normally be a problem to me but my LTR's best friend is also a female who is openly bi. I can tell that the female friend REALLY likes my girlfriend and wants to be more than friends (she always tries to hang with her, she actively tries to dominate me in conversation). Whenever I try to dominate my girlfriend's best friend in conversation either directly or indirectly by retaliating with my own attacks whenever the best friend insults me, they both turn on me and get all hissy, whenever I try to even spark ANY form of conversation with the best friend theres a 40-50% chance that she just shuts me down and instead of conversing just resorts to insults (I can tell she is incredibly jealous of me).
Wondering how to approach the topic as it’s clearly questionable. Do I ask if my girlfriend has any sexual interest towards her best friend? How to I express boundaries in regard to that being weird for me? Since it’s like hanging out with a friend who wants to fuck you, how do I know there isn’t mutual interest