Yelling out your distaste for someone has a much more final feel to it than two people just gradually drifting apart, never noticing when the fade is so complete that you have trouble calling their face to mind.
As I said, it just fades away, until one morning you awake with tears in your eyes because that back part of your mind never really went along with the front of your mind. That one section refused to forget. You get up to stumble to the computer and enter the name in a search; about a hundred possibles pop up. You refine the search on Facebook, and there she is. Like you, she is fifty years older, happily married, mother, and grandmother. The lines of happiness are etched on the features that you almost remember. In the profile photo, she stands next to her husband, who you also almost recognize.
You pause over the tab to send a friend request, think about it, and then move to Messenger.
In the end, you smile and stumble back to bed, happy that things turned out well. Not a bad end at all.