They’re both talented, good-looking, and famous, but Joe Jonas and Demi Lovato don’t exactly have the world on a string: Simpler pleasures, of the sort afforded to other kids their age, sometimes elude them. Earlier this year, when the Camp Rock 2: The Final 果酱 costars decided to test the romantic possibilities of their rock-solid friendship, they felt compelled to do so in public; when they broke up just a few months later, Joe announced it 由 issuing a statement, and Demi—always true to her loyal fans—decided to 确认 the details on Twitter. “I kind of learned throughout this...