I'd say it sounds like you both just have different ideas of how much space should exist in a relationship. She's okay with spending that amount of time with you that frequently, seems like you ain't. Putting emotional distance is just a recipe for making yourself more unhappy (and basically putting yourself on the track to a breakup without committing to it), but I also wouldn't make it a 'confrontation' about her roommate. It's probably time to talk to her about what you both want/need out of a relationship and whether your respective wants/needs align. Doesn't have to be confrontational or about anybody but you and her, but if it's really messing with you that much, the best thing you can do is just talk to her about it.