The first time I saw Matvey Gromov, his girlfriend drove into my car. The second time, I splashed him in the head with my cocktail—and he promised he’d kill me. The third time, he burst out onto the stairwell in a single towel and ended up at my place. A brazen bully, pushing straight ahead, a cad who gets his way at any cost. And this time, to my surprise, his target is me.