We hurt the ones we love...
...but only while they let us. Let's get back to the Sexual Stock Market, shall we.
I have watched a lot of my friends' relationships come and go, and there is one truth that always comes out. Someone is always the giver, and someone is always the taker. Truth be told, each partner is both a giver and a taker, but by the end of the relationship, there is always a clear indication of how those ratios were actually split. Typically, relationships end when the giver has run out of goods, thus resulting in the taker deciding to skip town (or getting kicked to the curb) to look for new markets to exploit.
I recently just saw someone I know end a very lengthy relationship. Why? Well, she couldn't bear the costs anymore. Her ROI was simply non-existent. And why did he think he could continue exploit her? Because he didn't think there was any competition. Unfortunately for him, the marketplace is wide open, filled with gentlemen suitors ready to make good on a lovely, intelligent lady's investment in them.
So... who's left in your rolodex now, my friend?