Background: my girlfriend and her best friend grew up together, but distanced when her friend became heavily addicted to coke. They always make plans to hang out but her friend cancels every time, so this is the first time they've seen each other in 2 years. My girlfriend and I don't live together on paper, but I spend 28ish nights a month at hers and have been told it's basically my house. Her and I love each other more than I've ever seen people love one another, I can't explain how amazing she is and makes me feel most of the time.
Her friend bought them tickets to a music festival, and my girlfriend immediately asked me if I wanted to come. I said I'd love to but don't want to interfere with their time together, but both of them insisted I come because it'll be more fun with me there. The next morning/afternoon my girlfriend and I had a road trip planned to see my parents as well.
While there one of the openers performed a song that has importance to mine and my girlfriends relationship, so I asked for 3 minutes to dance with her. Her friend said that's fine but she gets the next 3 hours, I agree. Later on in the night my girlfriend goes to the bathroom, and her friend goes off on me. She tells me how unwelcome I am there, that neither of them want me there, and that I have ruined the night. I'm told that my girlfriend only invited me so I didn't feel left out. I apologize for overstepping, and we make a plan – when we get back to her place I'm gonna go to bed, theyll have their night in the living room, and my girlfriend and I will hit the road in the afternoon after they spend some of the day together.
My girlfriend gets back, I try my best to smile through the hurt for 10 minutes then go to the bathroom. While I'm gone the concert ends, we have a hard time meeting back up, and I walk 10 blocks back to my girlfriend's place while they Uber. We get to her place, and I stayed up with them for one drink so it didn't seem awkward, kissed my girlfriend, and went to bed.
5-10 minutes later her friend barges into the room, demanding I leave now. She tells me how unwanted I am there, that I never should have been there from the start, and that she "wants to sleep in the bed with [my girlfriend] like they used to". I get upset at the disrespect I'm being shown in my own girlfriends house that I effectively live in, and that I don't want her naked with my girlfriend in bed.
The argument bleeds back into the living room while I'm packing my stuff up, and my girlfriend immediately sides with her friend. My girlfriend tells me I'm unwelcome and kicks me out. I plead my case at how unfair that is, to invite me, insist on me coming, then tell me I'm unwelcome. I also plead that a partner should have their partners back, my girlfriend responds that she didn't even know what the fight was about and defaulted to siding against me.
I texted my partner at 8am to let me know when I can come get my stuff when she wakes up around 2pm (night shift worker), but she texts right back that I have nothing there. The first time I've ever seen her up at that time is the first time I've seen her hang out with a cocaine user. Now she's going off about how I'm a narcissist, I always make everything about me, and how immature I am for being upset about this. I told her I would never let anybody show her the disrespect I was shown in either of our houses, and she argued that I was not shown any disrespect whatsoever.
TL;DR: my girlfriends estranged drug addict friend kicked me out of our home and told me neither of them want me there, my girlfriend sided with her and made me call an Uber. This relationship is over, isn't it?