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I only one one sentence to say: DO NOT, repeated DO NOT, DO NOT ever under any circumstances get involved with someone who is 1) Married or 2) in a relationship (already have bf/gf) Simple as that.
Don't give a S-h-i-t if their relationship is happy or not, the key here is they NOT available, they taken.
This is MORAL and respect issue, don't become the third wheel in someone relationship.
So you leave she alone to solve her OWN relationship, when she cut all ties with the bf, and become single again, then you can approach her. Simple as that.
Must add...do not get involved with a girl breaking out from a recent relationship as well, you can date her as a friend...but let her work on her own issues.
Go to grad school. Get on with your life. Eventually, you will meet a woman who is actually available. But you won't if you spend all your time hung up on an unavailable one.