I'm sure you have done nothing wrong, So I wouldn't worry about it too much.
You have voted with your feet and Wallet.
It has happened to me with two girls, one after seeing her for 5-6 times she started getting lazy,
complacent and started giving me attitude.
Another Prima Donna recently did the same but was worse much worse.. just plain rude,
just glad I had only seen her 3 times, though 3 times too many.
Btw I'm always respectful so I can't fathom it.
How well do we know our so called favorites... apparently sometimes not at all..