“Best thing I ever did was fall out of love,” Future says near the end of DS2. It’s a quintessential Future line, plainspoken but subliminal, steely but wounded, a flex that’s obviously spin — especially in the context of the bitter and addled music that precedes it. Falling out of love isn’t a choice; like an actual fall, it happens to you, the decision-making taking place after the plummet is underway. But in the topsy-turvy world of DS2, which turns 10 today, everything gets screwy: cause and effect, joy and pain.