"He's Just Not Into You."

Miriam (Tim's wife, who is much more in the pop culture loop than I now) was telling me about the above phrase and resulting book -- something to do with that being the response to a woman's question "Why hasn't he called me for __ days (or weeks)?", as if that guy (whoever he is) can speak for all men. Well, Miriam and I agreed that it's not necessarily true. Of course, it's not. That just seems so obvious to me.