Context: we’re all polyamorous.

My best friend (call her A) and I have been friends for almost 4 years. Recently she‘s met someone at Uni and got into a sort of relationship. I say sort of because it seems they aren’t like a full on couple, but rather friends with benefits, my friend said so herself. Cue a month ago, there‘s a club at Uni and A invites me. I show up and her girlfriend (B) is there too, we introduce ourselves and the event gets underway.

After the evening is done, B and I realize we almost have the same way home. So we get on the train, talk and get to know each other and realize we get along quite well. I tell A about it and she says she‘s glad. Later I get a looong text saying how A doesn’t want me and B to start dating, as it would make her extremely uncomfortable. I will be honest, I did find B cute and would‘ve put in effort to get this further, but I ditched that idea and told A that we wouldn’t and not to worry. Because a possible FWB type situation is NOT worth my best friend, no matter who it is.

Now, B and I made plans to go on a walk and watch a movie because we bonded over liking the same genre. Some days ago A called me and said B told her that we‘re hanging out. I confirmed and she seemed to get kind of jealous. Not mean or passive aggressive but I knew she was unsure. I, again, reassured her that I will not date B, but I couldn’t completely convince her. She is afraid of „losing“ me and her girlfriend B by us dating (which we won’t).

Would I be the asshole if I made friends with B? I really have no intention of any relationship other than platonic.