Song about cheating on your bf with his&your best mate

hey...please could someone help me find some songs about cheating on your boyfriend with his and your own best mate.
cos I sorta did that :/ I feel really mean, and it doesnt help that he was really nice about it when I told him......but I know it hurt him.
i ended up having sex with a really good mate of mine (hes a guy & im a girl) and hes also a good mate of my boyfriend too.
i really want to find a song that I can cover/listen to to help me (and my bf) through this, so I can show him how truly sorry I am. please could you help me.....

You'll love this. :-)

http://www.youtube.com/watch?v=60qOs4x8rCw

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