Here's a pro-tip...
If a girl who has convinced you that she wants to be with you suddenly changes her cell phone number, and then you call her house phone and discover that not onlydoes she not give you her new number, but her former boyfriend (you know, the one she complained about stalking her and giving her grief in public) is at her house without the stressed tone of voice that comes from being kicked out...
... leave it alone. Find another hobby. She's not worth it, and neither is the emotional beat-down you're already experiencing.
Just sayin'.