Last year, I was diagnosed with Borderline Personality Disorder. At first, I balked. Like many people, I’d heard terrible things about this mood disorder, which was supposedly popularized by Glen Close’s creepy character in Fatal Attraction. Borderlines were supposed to be among the worst people in the world, without their own identities and completely unhinged. Or at least that’s what I thought. I resisted the diagnosis for a minute, and then agreed to learn about it.