So, a housemate, whom I have to live with for another nine months, has developed a crush on me.
If she wasn't a housemate, I'd definitely be interested if it weren't for two other points:
1, She used to (sort of, briefly) go out with another housemate who's a great guy. He broke up with her, I believe, but still.
2, Barring exceptional circumstances, I won't sleep with a girl that a friend has slept with already. I just don't like the idea.

I need a way to put her off, quickly, but without the potentially hurt feelings of telling her I'm not interested in her, and without having to change who I am.

She's about a 7, and like I said in other circumstances I'd be interested because she also has a great personality, but as it is... advice would be appreciated.

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"Plan only what you must and live for the present - for tomorrow everything could change." - Personal Motto.

How much has she insinuated a romantic intererest with you? Has she actually expressed a romantic interest or is it hearsay?

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Pure in mind, pure in body, pure in game.

grandpapua.wordpress.com

Well I can read the signs in any case, but here... not so much signs as great, big neon-lit billboards outside my window. Not literally, of course.
It's implied, but very heavily.

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"Plan only what you must and live for the present - for tomorrow everything could change." - Personal Motto.

LJBF her. We always do our best to stop people from getting hurt, but in this case it's just damage control. There isn't much else you can do.

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Don't hate, just dominate.