I got this from a shrink in the student counseling center when I was in undergraduate school: I was into a girl that wasn't into me.He told me something very profound: Your commitment to a relationship is proportional to your investment in it and not your profit from it. Think about that. A very important corollary from that is this: For a relationship to succeed with two partners who are both happy, their emotional investments must stay fairly equal over time.That's not to say one won't be invested more than the other at some point but before very long, the investments will even up again.That's the basis for, wait for it, wait for it, The Rules. The gals who wrote that understand that men and women invest very differently. The thing most gals don't get it that men invest by pursuit. That's why you make him chase a prudent amount.The other really good advice I got was this: men give love to get sex and women give sex to get love. Men particularly are prone to disconnect sex and love and it's only by getting him emotionally invested on a equal basis that you avoid the disconnect.Hope this helps.