Stevie Nicks did not leave the “shacking up” qup unanswered:

I very much resented him telling the world that ‘packing up, shacking up’ with different men was all I wanted to do."

Sourced here

Caillat told Music Radar:

Lindsey was beating his acoustic guitar as hard as he could and screaming his lungs out. The first time I heard it, I thought, ‘What the heck is going on?’ [laughs] It sounded so non-musical. I didn’t know if anything would come from it. As the months went on, we filled it out and it became a song. Lindsey figured out some fantastic guitar parts to lay down. In particular, he did an acoustic part on the 1, a flourish overdub, and that really drove the rhythm.

There’s two guitar solos, the tag and the first one. For both, Lindsey didn’t know what he wanted – the song had progressed from an acoustic piece into this searing electric rocker. I gave him seven or eight tracks and he comped the solos. They sound seamless, as if they were totally composed, but they weren’t.

Rolling Stone named it the #1 greatest Fleetwood Mac song, saying:

In 1976, early in the recording process of what would come to be Fleetwood Mac’s epochal album Rumours, they took some time off from touring and rented a house in Florida to work on
new material. With the two relationships at the center of the band unraveling, it may not have been the best time for a family vacation: ‘Aside from the obvious unstated tension, I remember the house having a distinctly bad vibe to it, as if it was haunted, which did nothing to help matters,’ Mick Fleetwood wrote in his memoir. While there, Lindsey Buckingham wrote a bruising new song that channeled the darkening anger brought on by his impending breakup with Stevie Nicks. ‘“Go Your Own Way” was filled with anger, it was filled with angst,’ he recalled. With an inverted stomping drumbeat and a taut, aggressive guitar part, it was also a hard-driving departure from the ‘light rock’ with which Fleetwood Mac were being grouped. ‘I had this idea taken from “Street Fighting Man,” by the Rolling Stones,’ Buckingham said of the song’s rhythm. ‘And Mick couldn’t quite get that, and he did his own thing.’ Released as the first single from Rumours, ‘Go Your Own Way’ became a Top 10 hit as well as their tempestuous set-closer, reigniting the drama at the heart of the band’s music every night. ‘I very, very much resented him telling the world that “packing up, shacking up” with different men was all I wanted to do,’ Nicks told Rolling Stone in 1997. ‘He knew it wasn’t true. It was just an angry thing that he said. Every time those words would come out onstage, I wanted to go over and kill him.’