Someone you didn't want to let go, but just drifted.
I have had several friends from our previous church whom I have drifted away from. Part of this is because I did not wish to be divisive in what remains their church. What happened for us there was a pretty messy situation and sometimes it's best to keep your distance and avoid spilling the nastiness onto others. So while the relationships aren't what they once were, the love is definitely still there.