Is AUTHOR wrong in the post ? POST : My girlfriend and I moved into an apartment that she bought a few months ago, so she owns the apartment, she pays the mortgage, I pay the bills. So I am not paying rent.

Last night she had a friend over and they were drinking and listening to music (not extremely loud) until 2 am and would likely have gone on longer, if I didn’t get out of bed and walk to gas station for smokes. 

I had gone to bed around 10pm (needed to do some work this morning) 

She asked me where I am going and I said to the gas station as I can’t sleep. When I returned from the gas station they were leaving the apartment to go hit a club.

This morning she is super mad at me, and claims I was rude to her friend because I didn’t come and speak with her and just said bye. 

It made me feel like a guest in the place I live and this was something that she assured me wouldn’t be the case if we moved into her apartment from a shared tenancy. AITA? 