Do we really know why she committed suicide? If it was because her business was failing what difference does it make what Jagger sings?
Reportedly she wanted commitment from Jagger in the form of marriage and a baby and he wouldn’t marry her and give her a kid. He is known to not want to marry and made it clear, but she hung on. She reportedly neglected her business and spent almost all of her time following his band around. So she did not work on her career and it started to go under.
It’s too bad since she did have beautiful designs.
If you picture him actually singing that song in front of a live audience after what has happened, maybe you'll see how sad that would be.
I went to art school with scores of women like L'Wren Scott. The life of a creative professional is a hard life in so many ways -- the constant pressure to innovate, produce ever greater works and stay relevant; and for the fashion designers, they must also stay gorgeous and endure the limelight and all that goes with it. She was extraordinarily talented, but like many creatives, lacked the business gene. Business failures, her history as an adopted child who towered over her classmates (she was 6'3"), the onset of menopause and Mick's unfaithfulness apparently snowballed. RIP.
I don’t think its a big secret that Mick Jagger has a speech defect. He can’t say no. :-)