whoever has liked him longer; even if it's only by a minute, hour, day, whatever; has the right to him. So if she is your best friend, and you've like him longest, she will understand. Vice versa.
Explain that to her, and you can only hope she will understand. You shouldn't be a b*tch about it or to her or anything just say you would like some time alone with him, and if she was in your position, what would she do?
hmm...maybe be a little mean and say oh yeah i cancelled but u didnt and hang with him alone. but if ur not mean then invite her over n then say they r both leaving this time but he could stay a little longer then her??
Explain that to her, and you can only hope she will understand. You shouldn't be a b*tch about it or to her or anything just say you would like some time alone with him, and if she was in your position, what would she do?