Women can be just as confusing as men.
In all seriousness however, I honestly don't think he was acting very responsibly in that scenario. I detest people who enjoy playing these mind games (or whatever bringing up his girlfriend after flirting with you classifies as), and I even have more disdain for people that seem to think casually messing around with people they've just met is okay, but that's just me.
If I were in your position, I wouldn't pursue anything further. But it's all up to you.