My (31M) GF(38) doesn't want me to be part of my best friend's (31M) wedding and is willing to end the relationship if I accept to be his best man. How can I navigate this situation?

My best friend of 20yrs got engaged earlier this year. I received a save the date for the wedding coming up this November. When my GF saw the save the date she made a comment asking if I thought my friend would ask me to be the best man or a groomsmen. I told her I'm not sure if they're doing friends or family in the wedding party since they both have several siblings. She then said if he asks you to be in the wedding you'll have to tell him no. Her reasoning being the responsibility of a bestman is expensive, she doesn't trust what would happen at the bachelor party and that she'd have to attend the wedding virtually alone since I would be directly involved in the ceremony, photos, reception ect. I told her that's a difficult thing to ask of me and while I understand her worries and anxieties about the situation this is something I'd want to do as my friendship is important to me and I want to be involved in my friends wedding. She said its not that we can't go to the wedding, I just can't be a part of it and accepting his offer would be crossing a boundry by compromising her mental health and well-being and be cause to end our relationship of 3yrs. Is there a compromise I can offer or a way to approach and revisit the conversation? submitted by /u/Dazzling-Abrocoma258 to r/relationship_advice [link] [comments]