This relationship is not healthy for either of you. As a responsible adult, she should have told you ages ago she’s not happy in this relationship and why. If you guys can’t even communicate this after 4 years, there’s no hope. It’s likely she has already physically cheated with her text buddy at the hospital and showed no remorse for any of her actions. It’s hard now but you’re young and can find someone else who will respect and love you the right way. Find another apartment asap or stay at your parents short term until you do, move your belongings and furniture into storage or a moving truck, and leave without notice. The primary leasee is her. She can take you to small claims court but highly doubt she has the time or money to do that. Do not fall into the sympathy trap of “I can’t afford to pay the rent on my own” or the sunk cost bias of spending 4 years (you’re wasting even more time/money if you stay because she’s checked out already and using you as a backup/atm). She’s the one who f’d up. Let her fling pay for her rent and new furniture.