Why does your boyfriend smile and laugh at other females when they pass by him?
He's ego-tripping and you need to pull the reins in on this guy. It's really impolite and a slap in your face that he does this. He is playing games and you need to set him straight that you don't play games and if he continues this bad behavior in front of you he can keep going! Nip it in the bud. He should be paying attention to you! Good luck