Hear me out please. Thought long and hard about this and I somehow cannot be comfortable with this anymore.

Today I 25 reached the peak of my concern regarding my gf 22 and her guy best friend.

Before you start getting upset at me, please understand that I have not let these thoughts control how I act or treat my gf. I have done my best in making sure that I can control that “insecurity “ if you want to call it that. We have been together for a year and 6 months. At the beginning of our relationship, I never thought this would be an issue again (one of my previous relationships my ex gf had a guy best friend that fell in love with her)

I’ve never had a woman as a best friend nor do I really care to form that kind of friendship unless I wanted to be with them romantically. I have very few women as friends. Had plenty of girls as friends in high school but never cared to rekindle a friendship with them because I am already satisfied with my male best friends. Overall, I get along with men and women just fine with no problems.

I have never met this guy best friend. She told me that he moved hours away for school. I believe they dated or maybe considered it before he left.

I am just bothered because of my last experience with a guy best friend and basically feeling like I was in a love triangle. Overall, I never have seen an issue with guy friends or acquaintances but guy best friend is a little bit of serious label to me while being with a woman.
Has anyone dealt with these feelings that can elaborate? I feel like my thoughts are normal. I trust my gf but I do know feelings change. I think it’s more probable when a best friend is involved. I feel like ive read these types of relationships on Reddit that ultimately led to feelings being formed.

I haven’t asked anything about their relationship. I’ve let it be like I should. I’ve only gotten info on him from her.

We live together and she wants a future with me but idk how to feel about another grown man being around forever.