In the 70s?
Jagger had a fuck load more money (he was actually always pretty savvy on how the band’s money got spent), and equally a hell of lot more star power.
Jerry did what Jerry does…she dumped Bryan and went after the money and fame.
But, just to underline the point that she knew what she was getting into, take a look at Some Girls.
Jagger wrote a number of songs to Bianca…Miss You, Lies, Respectable and Beast of Burdern. And wrote a number of songs about fooling around…Some Girls, Far-away Eyes, Just My Imagination(cover, but not about Jerry). Indeed the album is often presented as Jagger trying to “work through” his divorce.
But despite fooling around with her pretty seriously for two years, there is not a single song you can say “Oh yeah, that’s definitely about Jerry”. Indeed, you’d be hard pressed to point to a single song in his entire catalog that fits that definition. But there a LOTS of songs about fooling around.
Mick fooled around with LOTS of girls (and at least one boy, if you believe the David Bowie rumors). But he only had a handful of LTRs…Marianne Faithful, Bianca, Jerry and L’wren Scott. He had a son with Marsha Hunt, but there were together for a year, tops. LGB is correct…he was with Carla Bruni and Luciana Giminez (who he had a son with) quite publicly while with/married to Jerry, who he had 4 children with. But none of those relationships lasted more than a couple of years.(Giminez was the straw that broke Jerry’s back…the son did it for her). He also had a son with Melanie Hamrick after Scott, but that relationship only lasted a couple of years. (Mick has had a LOT of children).