I haven't bothered to look up any of my exes, from facebook or through friends, I don't know what they're up to and quite honestly I see nothing good from finding out such things, I just don't care. There's a reason they have the label "ex" and a very good reason at that.
It sucks to learn how little you can mean to someone, though. 
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If Jesus died for my sins, then I should sin as much as possible, so he didn't die for nothing.