Break Your Third Date
Here's a tip that's hard to follow BUT works every time.
Break your third date!
Call her two days before that date and say, "Hi, Donna. Sorry but I have to cancel our get together on Friday. Something unexpected has come up. I'll talk to you soon!"
Nice, lonely guys are afraid to do this, but it will increase her interest level in you 10 fold. Works better if she's very pretty. She is not used to it and doesn't expect it!