The "knowing look", the "i have a bf" despite going on an insta date with you, and the "i don't use facebook" bits are making me come up with a feeling that there was something else going on here more than indicated by the text. My Spidy sense is tingling, although that could just be indigestion. Maybe you fizzled out after a strong start and she changed her mind. In any event, instant dating a 9 in the day is good stuff keep at it.

To the "i have a bf" line, you can say deadpan, "really, how's that going?". She'll either laugh at your audacity if she's bright, or say it's going well in which case you try to make her a friend not a target (i hate that word), or she'll be non committal or negative about it in which case you can keep her in orbit as it's not necessarily a real obstacle. It can be a shield, you can't react to it until you're sure she's not just trottin out the party line.

PS