How do I get my cat to like me again?

Me and my freshman year roommates adopted my cat (Roxy) when she was a kitten. She had always chosen me over everyone else so I ended up taking her home for the summer and declaring her as my cat. Roxy used to sleep with me every night and never leave my side, she’d follow me everywhere. We moved into a new house in the fall with pretty much the same girls and everything was fine for a while but For the past two months she hasn’t slept on my bed once and it seems that she now likes my roommate much more. Whenever I try to pet her or anything she just seems mad. I’m the one who feeds her, plays with her, and gives her the most attention but it seems she wants nothing to do with me anymore and it kills me. I don’t know what to do I have tried everything like giving her more treats, letting her come to me, and pretty much everything under the sun. I don’t know why she is suddenly acting like this. If anyone has any tips please let me know I’m so sad