At dinner with friends after the show, I was unusually quiet. They'd invited me out to a musical — surely the lightest, most transitory form of theatre. Yet I'd seen a deep, thoughtful masterwork that accurately encompassed all my own fears and insecurities. There was Bobby, dismissing the idea of spending a life with one person, "someone to hold you too close, someone to hurt you too deep". To which his married friends tut-tutted, and extolled the virtues of coupledom. "Don't be afraid, it won't be perfect," sings one, "the only thing to be afraid of is that it won't be." "It's better living it than looking at it," suggests another.