Most Helpful Guy
If i had to guess it's one of 2 things. maybe both.1. He likes you but is intimidated enough to not talked to you normally 2. he talks to other women because he feels no real connection to them but by talking to them he doesn't make it obvious he's interested in you. Plus it gives him insight in to what you think of him. If you react it signals your interest in him.
Most Helpful Girl
He could either be shy or just likes to look at girls