Following the depths of Valentine's Day, there is a new app that Eternal Sunshines your Facebook timeline of your former ex so you never have to worry about running into them again. This should have been a thing before February 14.
The Killswitch app is pretty straightforward. After installing the app, link it to your Facebook account, and identify the target you would like to delete from your Facebook memory. Killswitch hunts through your account for relevent posts, selects the ones you'd like erased and then, poof. Sweet relief.
And you don't have to worry too much about losing the memories forever. The photos you kill will be stored in a hidden album so that when you decide you don't hate her/him any more, you can reinstate the photos.