Need advice.

The players: me, man, early 20s My roommate, man, early 20s (we’ll call him “A”) My FWB, woman, early 20s (we’ll call her “B”)

Context: months ago, A told me that he had slept with B over a year ago. A made B out to sound like a sloot; she was cheating on her boyfriend with him, and sleeping with other guys at the same time that she was sleeping with B.

I didn’t care, I’m not looking for a girlfriend. And it’s my pussy, just my turn.

The other day, me, A, and B are drinking in the living room with some other people. A says “all I need is a girl who’s at least a 7 and gives a good back massage”. A few days after that, B is in my room, we’re naked after sex and she’s giving me a back massage. I’m loving it, when all the sudden she says “what was A’s requirement for a girlfriend? At least a 7 and can give a good back massage”. I respond with “do you really think that me and A have the same requirements for girlfriend?” She answered with “It’s not like I would ever want to do anything with A”. At which point I push her away and tell her “that’s not how he tells it”. She denied anything happening between than, claims the other thing that happened it that A tired to kiss her once. I told her that it was between A & her because that’s not my situation. I also said that I would prefer that she not use my name when confronting him because I’ve only been living with A for 2 months and don’t want unnecessary drama, but if need be she can use my name and I wouldn’t care. She said “if you don’t care, I don’t car what he said. It’s not like we’re 16 anymore”.

I don’t care if they had sex. I was under the impression that they had. The fact that someone is lying to me is something I cannot reconcile.

My plan is as follows; next time me, A and B are all in the same room together, I’m going to say “Everyone knows i like to know where I stand with people. Part of knowing where I stand with people is knowing who is comfortable lying to me, and one of you is lying to me” and then proceed to explain what I am referencing if need be.

Both A & B claim to have “an incredible amount of respect for me”. A has told me he loves and respects me. B has been pressing me for a relationship for over a month and claims she respects me so much it’s “scary for her”. Someone obviously doesn’t respect me, or has a screwed perspective of respect.

Thoughts? Advice? Suggestions? There’s literally no one else I can talk to his about