I...don't see the problem here, if I'm no longer associating myself with someone why would I leave pictures and statements (like relationship statuses) stating the contrary.
Example: you just break up with someone, you may change your status to single but you leave the pics on the page. A month or so passes by and you meet someone new they ask for your facebook page (strange as it may seem, facebook is an easy way to stay connected with people you know), which they then visit and see pictures of you with another guy/girl, they will see this and either think you're two-timing them, or they'll think you still haven't gotten over that person yet, which may lead to complications in your current relationship with them.
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I am so omniscient, if there were to be two omniscience's I would be both! Prepare yourselves for the subjugation! - Ziltoid The Omniscient.