I’m 32, I’ve had 2 other LTRs in my life both of whom I put on a pedestal and they both cheated and left after about 2 years. I did tinder for the last several years and had a pretty good time, had 4 different girls I had great times with and never gave an ounce of my emotional self to. These all ended either mutually or when I wanted them to, and all positively. Recently I met a girl and I guess just felt ready try a LTR again. It’s been great, she’s 24, Christian, was a virgin (or so she told me), not on social media, a talented artist, really smart, likes to just hang and play video games with me or go see music or to the museum, there’s essentially zero bullshit in our relationship which is about 6 or 7 months official now. She’s an introvert, has 2 close friends, a super gay dude and her female best friend from high school. I’ve never put any pressure on her to act or behave in any certain way, and I’ve never given in to any pressure she’s put on me, which hasn’t been very much. I think it’s just known between us that if she fucks up I’m gone. She genuinely seems to be in awe that she actually got an older guy to be her bf. Anyway, her female friend is a fairly high value slut. Young, quite attractive, smart, loves having fun, makes her own money. I don’t even know that much about her but I’ve already witnessed her fuck through a few different guys through stories my gf has shared and her behavior when we’ve been out together. The friend is planning a trip for just the 2 of them this spring to Colorado. My GF has talked about it with both enthusiasm and some trepidation “I kinda wish at least one other person was going” and she generally talks about her friend’s behavior negatively, yet she obviously views her as her “fun, exciting” friend who she looks up to. I feel it’s virtually guaranteed they’re going to get involved with some guys while they’re there and I’d put it at at least a 50% chance she’s going to end up with at least 1 dick inside her. I know that her friend, who has influence over her, is going to encourage this. I don’t want this. If this was a tinder fling I wouldn’t care but I’ve agreed to be her bf, we’ve had the exclusivity talk, I’ve put work into a relationship with her family, I’d rather just end it than allow jealousy and mistrust to enter the picture. I feel I have to suck it up and choose to believe she’ll be faithful or plan for this trip to mark the end of our relationship, both of these options just make me feel sad. Any insight? Thanks guys.