OK, so this has happened to pretty much every married Facebook user, right? An old flame, or even an old friend of the opposite sex returns to your life with a "bang" when that "friend request" comes into your mailbox. Just stand your ground, and be happy that they don't look so great after all these years. And if they do, well just remember that annoying thing they always did. There may even be pictures now of that annoying thing. Share those pictures of that annoying thing with your friends that still remember this person. See? Problem solved.