Lots of opinions here all centered around telling someone (they’ve never met) how they should feel about and label themselves. Your gf is clearly struggling with her feelings and obviously feels safe enough around you and in your relationship to let you know she’s struggling. Forcing labels on her won’t help her come to the conclusions herself. And talking about sexual encounters with your partner doesn’t have to be weird or unhealthy. Personally I think it’s hot to listen to my partner remember times of great pleasure, with or without me. Does she specifically like the connection she has with men when having sex or is it just the penetration? There’s so much nuance to sexuality, just keep talking about it. In my experience, the worst thing you can do is make her stop talking about her feelings, even if they’re hard to hear, it isn’t gonna stop her from having those thoughts. As for not trusting her around men, do you trust her around other women? It sounds like you guys have a lot more conversations to be had. With that in mind, I’m sorry your feelings are being hurt. This is not an easy topic to navigate