FYI we're still monogamous but open to something non-monog down the line.

Does he know about this? Yes, kind of, we have spoken about my jealousy before, and I found it very helpful. Also, I have met the friend and TBH I like him, so I get it lol.

The situation? My BF and his friend (whom he has know for about the same amount of time as he has known me) has what I would call a very close and intimate relationship, ie when they get together they have very deep and emotional conversations. As far as I know this is purely platonic, though both of them aren't 100% straight (heteroflexible?). They don't meet up regularly. I don't know how frequently they text... anyway

I support men having close relationships, platonic or not. As a society we need to do a lot to overcome toxic masculinity. However, I have a hard time reconciling this value with the feeling of being inadequate or replaced. Even though I know we can't be everything to our partners.

I also feel like a damn hypocrite. First, because I am bisexual and I also have needs that sometimes can't be fulfilled by my partner (see: bi-cycling). I have no desire to cheat, but I need the room to explore mentally / in my fantasies (which he has consented to). Frankly, I don't feel like a good enough partner sometimes.

Secondly, the fear that he might "cheat" on me (emotionally, physically) is purely there because he isn't 100% straight either (excuse me for using this term – it's just that he has never explicitly used the bi label ). I find this very biphobic of me. Again, really trying hard to reconcile my values with my feelings...

So, do I need to bring this up again? If I do, I'm scared of making it sound like I'm accusing him of doing something wrong. Can I manage/process my feelings on my own, in a healthy way?

TLDR; Jealous of my maybe bi BF's intimate bromance, trying to reconcile my feelings with my anti-toxic masculinity, anti-biphobic values not feeling like a loving enough partner sometimes. Haha I'm chaotic