“You had to tell her,” says Bobby. “Well, I thought about it all weekend,” says Jill. “I weighed the pros and cons. But then, yeah. I had to tell her.” “Betrayal,” says Tina. “Do you know what that word means?” Things get heated. Things get loud. But fear not, this isn’t some end-of-year meltdown — it’s a live, un-miked, guerilla-style performance of “Tough!,” George F. Walker’s provocative tragicomedy of youth, relationships and thwarted potential. “Tina is angry because she heard Bobby was flirting with another girl,” said William Whitaker, professor of...