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From the information provided, I'm assuming you still don't know her THAT well, so breaking contact won't do any good. Breaking contact is only to be used on girls you are in a relationship with or a girl that likes you a lot. If she's flaking out, then there's a reason. The reason doesn't have to be you. There's a lot of several reasons out of your control. Just let it calm a bit, a week or two and then re-initiate. If she's still flaking, I'd suggest you move on with it, there's nothing good for you out there and there's a lot of other girls who'd make you feel happier than she does.
No Contact isn't just a tool for bringing girls back. I think he should go into No Contact; it'd help him stop chasing her, definitely.