I’m sorry you are going through this. My daughter went through something similar and we all knew it was a problem in October, yet it took so many more months to be resolved. Maybe you can request a mediation. RA’s also have supervisors that can help as well.
This is the part about being an adult that is hard- living with other adults and learning to be reasonable, considerate and having to compromise, all while communicating respectfully throughout the process.
You are almost at the finish line. If you can just hang in there for another month, since you’ve made it this long, you will be done with the roomie. Learn from this experience. Think about your part in it and how you can do better in a situation that comes up and much sooner than this time. Seek out a counselor on campus they can be incredibly helpful in these situations for you to process the frustration and emotions around this. Be well and finish strong.