<human>: Essentially, they've been friends for a long time, and they've slept together a few times. 

We've been together for about 2 months, with a 2 week break in between. 

When he and I broke up briefly, she was right there with him, getting drunk and sleeping in the same bed because she said she was "too drunk to go home", but later hinted that it was a ploy to get in his pants.

She has always fantasized over him because he is older, and he was her "knight in shining armour" when her life was dark. I understand that and don't blame her.

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They're good friends now (apparently platonic, although she has told me that he keeps flirting and making passes, but she "respects the relationship too much to hurt me". (Which just makes me think that if i wasn't here, she's be all over him like bees on honey.)

She's otherwise a lovely person, and I feel awful for feeling this way, but I just can't be okay with it, no matter how hard I try to just get over it. What should I do?
Keep trying to bite my tongue? say something? continue drinking?

Give me the gist of the text in a nutshell
<bot>: she wants him, he's wanted her in the past, and I can't keep biting my tongue. what can i do?