My group of friends is very flirty, and it sometimes can make it hard to tell if someone actually likes you or not! We've gotten a bit less so over the years but it's still pretty normal to see lots of physical contact, joking innuendo, and so on. I love 'absurd' flirting, but am not so into the physical contact stuff. so I'll absolutely declare my mad passion for a friend of mine, or straight-facedly tell someone I'm stalking them.
This guy you met might be someone who is constantly keeping his options open, or he might just be super friendly. Also, he's presumably single right now, and so I wouldn't think it would say much about how he is in a relationship. He might've met you and found you attractive, but also found the other women attractive--in which case following up could be helpful. He would be like 'oh yeah, she was really cute!' and get to know you better.