Can't tell if my girlfriend is being genuine about her relationship with her best friend (M)?

toadstoll27
We have been dating for 5 months. My girlfriend is extremely outgoing and has more male friends than female. The only exception that bothers me is her best friend, which she has known for 7 years now. She has made it very clear that this has been a problem for her in all 4 of her previous relationships and that she was not going to drop him as a friend. I understand that as I wouldn't want my significant other dictating who my best friend is. He lives a little over 2 hours away from where her and I are now. They communicate over snapchat and whatsapp and she refuses to open any of it if I'm around, she will just ignore them.

She has seen his penis and he has seen her body parts naked but not everything at once. She showed him her vagina after he was making fun of her for it being disgusting one night. He has seen her topless on accident over the years, no specifics on this. She didn't explain to me how she saw his penis and kind of deflected the question when I asked; I didn't want to dig in it so I let it go. They sleep in the same bed while spending the night at each others place. She swears up and down that they both think of each other as disgusting and that they have never and would never do anything of the sexual nature. The one time he came over to our apartment, they were playing footsies the entire time and I felt like I was the one third wheeling as we hung out. I get it, he is her bestfriend and that's ok to have a friendly relationship in that way and I shouldn't be jealous. I love her more than any girl I ever have in my life and I know if she ever did anything to hurt me that it would destroy me mentally, she's the first to make me feel this way. It's bothering me deep down that I could possibly be letting my guard down and setting myself up to get hurt really bad, and I don't want that. I'm unsure of how to ask her about specifics without hurting her, as it has in her past. The only thing stopping me from just asking her is knowing it will upset her.
Can't tell if my girlfriend is being genuine about her relationship with her best friend (M)?
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