come undone verb in a literal and figurative sense: to fall to pieces; also, to meet with difficulties or disaster UK,1937
I’m contemplating, thinkin’ about thinkin’ / It’s overrated, just get another drink and / Watch me come undone [...] Because I’m scum, and I’m your son / I come undone / I come undone — Robbie Williams, IComeUndone, 2002