Need some advice

Me and my boyfriend have been together over two years. Over the last four months I’ve been having a really hard time with my ex-best friend. We live together at a uni house and she is just vile. She was insulting towards me and my mother when she visited over a cleaning rota when I was going home for the week (I had cleaned just not to her OCD standard) anyway her and I are not talking. And she has been disgusting to me since, isolating me away from the other four girls in the house. Anyway, my main issue is that i just can’t seem to find any libido. I just don’t want sex with my boyfriend. We haven’t had sex in nearly 2 months and I don’t know how to get it back. My boyfriend is so understanding etc. But this whole situation is effecting my mental health. Unfortunately I cannot move out, and I just really need to find some happiness somewhere and I feel personally although my boyfriend doesn’t agree that this is affecting our relationship?

Any advice is appreciated.