Room Mate With Boyfriend - Clarification

Message:

Asalamu alaykum wa-rahmatullāhi wa barakatuhu. I am a Med. Student and I live in a hostel. We are three roommates. My senior and I try to practice Islam. We are not perfect Muslims, but we try to practice. My third roommate goes out for late night parties and is in a relationship with a guy. I stopped her many times, but she did not agree. Then when she goes out for late parties, after she comes from there, I am not able to behave normally with her. I talked to her only the required things, but then I get back to normal after a few days. Then she complained to me that “whenever I go out, then you don’t behave with me normally. Is this what your religion teaches you? You practice one part of religion and you are neglecting another part by hurting me by not talking with me.” Now whenever she goes out or when she tells me stuff regarding her boyfriend, I try to be a good listener and behave with her normally, but somewhere deep down in my heart I get hurt. I don’t like talking to her when she does irreligious things, but I compel myself to be normal because I do not want to be the cause of anyone’s sadness. I don’t want that she gets hurt when I don’t talk to her, but I get suffocated by seeing her irreligious things and always trying myself to be normal. Should I change my room or should I stay there although I still have two years in the Med. School? Please help me in this regard.

Wasalamu alaik