There's a difference, I feel, between having to cancel on someone occasionally due to unforseen circumstances, and a prevailing can't-be-arsedness. Obviously this is only one side of a story, but it gives the impression that the lady in question has the OP fairly low on her list of priorities.
"I can't come out, I'm skint" is particularly galling, as if it were me least, my reply would have been "I'm taking you out on a date, what do you need money for?" If skintness applies to both sides (or if she really means "you never buy me a drink you miserable tightwad") there's plenty of things to do that don't cost anything. How much will a walk in the park feeding the ducks set you back? Or hell, a night in with pizza and a movie followed by some bedroom enthusiasm isn't exactly going to break the bank either.
Strikes me that if you can't talk to each other sufficiently to organise a date without a) her coming up with lame excuses and b) the OP being unable to provide solutions to said excuses, it probably wasn't to be.
But yeah, sorry dude, that sucks.