I noticed with a guy I'm seeing, if we're out in public and there's a guy walking by or something...he will look at them then look at me and do that till they pass by. And sometimes these guys won't even be looking at me, it's like he waits to see if they will?
Or another example is, if he's walking ahead of me ( he with his friends, me with mine) and we're passing by a group of guys he will stop, stare at them, then stare at me.