People Change
I think some of the girls you date never leave you. Not that you dream about them at night or constantly compare them to all the other girls you date. It's not that at all. It's just that, for some reason, they always carry a special place in your heart. You love hearing about how their doing, and especially enjoy hearing the great things that are happening in their lives! Even though you know it might be inappropriate to contact them in the usual ways, you still enjoy it when someone in your family or one of your friends says, "Hey, you remember 'So and So'?"