Graham Nash says that Crosby, Stills & Nash are unlikely to ever perform together again, and he lays the blame squarely on David Crosby. Talking with Lust For Life, Nash tore into Crosby, who he says has been 'fucking awful' to him over the last couple of years, adding, 'I've been there and saved his fucking ass for 45 years - abd he treated me like shit.' And he didn't stop there. He also says 'David single-handedly tore the heart out of CSN&Y and CSN.' Wow.