My roommate is constantly fighting with her boyfriend... What should I do?

Okay -- a few notes:

- My roommate is clinically bipolar, and therefore really emotionally unstable

- Even though she's taking medication, I feel like she's just an overly serious, critical person

- She's constantly fighting with her boyfriend about the stupidest things, because she overanalyzes and is kind of needy

- I guess it's not really her fault, but at the same time, I can totally see how difficult this must be for her boyfriend

- She's not happy with him, but she relies so heavily on him for emotional support that I don't know what she'd do without him

- It's also kind of annoying for me, because our walls are really thin and I have to listen to this all the time

- I have no good advice to give, because I really can't relate

So basically... I can't fix the situation. I don't know how to help her, and I also know that it's selfish, but it's stressing me out!
My roommate is constantly fighting with her boyfriend... What should I do?
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