Is AUTHOR wrong in the post ? POST : So basically my relationship with my roommate isn’t great. We don’t have much in common and she’s messy, inconsiderate and kind of annoying to me. But despite this stuff I try to be a decent person and not do anything rude to her and just get through the rest of this semester (we’re both in college and I’m moving out at the end of the semester). 
Anyway, the reason I don’t want her boyfriend staying over is because she invited him without telling me he was coming after I’ve asked her to let me know. Also, she spent nearly the entire day cooking for him in our (very small) shared kitchen so I wasn’t able to use it for hours. She also let him stay at our apartment all day watching Netflix. 
I’m planning on basically saying that she can’t invite him over if this is how they’re gonna behave. Also I’d like to know if there is anything I can do legally to get him out if she invites him again. 