Hmm... well it IS possible what he says is true. On the other hand, what kind of friend says that the only possible reason a girl likes you is for your money? Doesn't he see your positive qualities aside from money? Maybe he is jealous that you have assets he doesn't.
To play the devil's advocate, perhaps this girl DOES like you. She asked you out, and you turned her down. (BTW - of COURSE she should expect a rapid response. Either you are busy or you aren't. They only possible reason to delay an answer is to check your calendar to confirm you are available.) Did you expect that she should never go out with another guy after you jilted her? And for a single girl to flirt should not be a surprise. How else is some thick-headed guy supposed to know she is interested?
As for paying for a date - if you ask her out, YOU should pay. It need not be an extravagant expense. Go to the park and throw around a baseball and buy her a hotdog or something. If she asks you out, SHE should pay.
Damn, some of you guys can sure be cheap bastards. What kind of girl do you think you will attract when you value trivial amounts of money more than her?
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?