How they act with people they want something from

I’ve noticed some people have a “split personality.” For example, when some guys see women they’re attracted to, they suddenly act friendly and happy; once those women leave, they're back to their old selves. I knew guys like that and, if we went out on a Saturday night, their eyes would dart all over the room searching for women as they half-listened to their own friends.

The thing about people like this is they don't really have an established sense of self—who they are changes completely depending on who they talk to.