Sigh. I understand being oversensitive at that time. I get that way too. :-)
unfortunately, if that is the way he worded it to her, she may well be expecting this to be a date with him, not a set up with his friend. Sometimes (and I DO NOT mean ALL guys here :-P ) some guys can say something like that and not realize how it will be taken by the woman in question.
Deep breaths and good luck.