For context this guy is actually her boss who groomed and manipulated her. They broke up in December and she asked me to move in to help cover the costs since they were no longer together. I agreed since shes been my best friend for 10years. A few weeks ago they started seeing each-other again and hes at the house almost every day. I do not like this man and dont want to share space with him. So i asked her to just have the courtesy to let me know when he comes over. Well 2 weeks since that message and she has not given me a heads up once despite him being here more than half the time since. This morning i come home after working an overnight shift to find his stuff sprinkled through the house, and him upstairs. This set me right off and i am truly ready to pack my stuff and go. I told her she’s inconsiderate and selfish for not considering me when i pay to live here and have made it so abundantly clear that im not comfortable with him being around. So, AITAH for telling her off?