I found this at Mick's book too:
At the time, she said something in a joking way about Lindsey being more interested in his guitar than he was in her, and she got tired of it and left. There was some conflict, I recall, about the "crackin' up, shackin' up" line in "Go Your Own Way," which Stevie felt was unfair and Lindsey felt strongly about.
Much later, Stevie made her perspective clear to me:
"Suppose Lindsey wasn't playing well on a particular song or something," she said. "As his girlfriend, I should be a comfort to him, right? You know: 'Who cares about it? You're great anyway!' I mean, that's what old ladies do for their men, right? But I couldn't, because I was also frustrated and saying, 'Look, if you could just get your guitar part tight, we could put the vocal on.' I'd be pissed off at him too. There was no way we could get any comfort from each other about what went on in the band. There was no love, because everybody was too nervous. And while we were traveling all the time, none of us had other friends to talk to...."
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