I had such clear-cut view of love when I was a little kid. I was supposed to love everyone because Jesus loved everyone, but I didn't have to like everyone (a point which brought me no small relief), and there were two kinds of love. There was the love I had for friends and family, and then the kind of love my parents had, that forever romantic love in sappy movies, that force permeating the air in churches and bride-walked aisles.
Then you get those kinds of love that start as friend-love then move beyond that into some kind of 'real' love (because somehow our culture thinks friend-love is rarely 'real') and then...you can lose it. You can fall out of *that* kind of love. Maybe sometimes it does last. I know once you choose to care about someone, some part of you can never really quit. But that kind of deeper love? Losing that or being forced to give it up is so damn hard. It plays with you in ways you never imagined capable.