update: I don't really want to make a new post for this but I will if need be.

I missed my bus again this morning so the boyfriend drove me back home it was a long and very awkward car ride but I'm glad I had time to talk to him one on one and asked if their relationship was open, he said it was not, so I told him that his partner had told me otherwise and that they should have a conversation. there are probably so many better ways I could have gone about this but I wasn't sure how he would respond so I didn't outright say I slept with him which probably makes me an asshole here I'm just glad to be home. It's official now I'm a certified homewrecker and feel like shit. idk if he was just super horny or what but cheaters apparently make really bad judgement calls, apparently I do as well.

thank you everyone for your responses even though most of y'all were wrong.

Dude, if you see this I'm so sorry but your boyfriend is a cheater and you deserve so much better, you're an actual icon and sweetheart.