I Am Drunk Drunk Drunk

So tonight I went to the bar to celebrate my 21st birthday.. and there was this hot girl and her boyfriend there.
She started to talk to us when her boyfriend stepped outside, asking us how long we’ve been in love and told us to kiss lol. So we did and we began talking to her, when her boyfriend came back in we asked him if he knew somewhere we could get weed and he said not at that time because it was late. However he had cocaine on him so my boyfriend left to the atm with him to be able to get coke.
I’m not into that, however when they were gone she had me slow dance and started talking to me a little bit. She was more so talking to the bartender like she’s been there a lot; she asked about how is relationship was going and stuff and she told him she didn’t know how she felt about the guy she was with, well supposedly when my boyfriend and her guy got back my boyfriend overheard her saying to her boyfriend that I was down for a threesome.
Which I never said I was down for!! If anything I thought she was down for a threesome with me and my boyfriend; so anyways me and my boyfriend leave and he starts arguing with me and completely left me alone and drunk in a state I don’t know with no phone and nowhere to go. Fortunately I had the keys so I made it back to the hotel because I’m smart and like a human gps😂 so I called him and tried to make sure he was okay and he was still being an ass; and this has just made me finally realize he’s not worth it. Any other guy would be by my side the whole time no matter what was said by some drunk girl in the bar... he’s pathetic. How could he believe a random drunk girl over me!? The girl I as kind of trashy too, talking to her boyfriend about how she was going to take a shit and stuff.. she was clearly drunk and all over the place. Why would he ever believe something he overheard especially on coke!?