Apparently, facebook is doing their best to try and not show you pictures of your ex all the time. The article that I read stated that they are reducing how often they show the pictures of people you recently dated.
The two other sources basically had the exact same story. One of the sources made a good point though. What if the relationship wasn't ever "facebook official"?
http://www.cnn.com/2010/TECH/social.media/10/20/facebook.ex.photos.mashable/index.html?eref=mrss_igoogle_cnn
http://mashable.com/2010/10/20/facebook-ex-photo-memories/?utm_source=TweetMeme&utm_medium=widget&utm_campaign=retweetbutton
http://www.ubergizmo.com/15/archives/2010/10/facebook_to_stop_showing_you_pictures_of_your_ex.html
