I not sure why but my cat hates my room mates. He use to be cool with them but now he gets super defensive around them. Me on the other hand he adores and he has been acting very aggressive with anyone who isnt me. He always was very shy around other people but it seems he is just getting worse. Now the only person he likes is ME and only ME. generally he was okay with me and whoever I lived with but now he just hates everybody who is not me.