Blake dumped his ex, and baby-mama, Brynn Cameron, who he was with for 8 years, to be with Kendall.
According to TMZ, Brynn is suing Blake for palimony, which is just alimony for people who were 'cohabitants' but not married.
What is alimony? "A husband's (or wife's) provision for a spouse after separation or divorce; maintenance."
In the lawsuit, Brynn is claiming that she and Blake made an oral agreement in 2013 that she would quit her job to focus on raising their two children. She did this so he could pursue his big NBA contract.
He also, "promised explicitly that, whatever the future might hold, he would take care of [her] financially and provide her a home for the rest of her life."
A month before they were meant to get married in July 2017, he asked her to sign a prenup. After refusing, stating that it went against their previous agreement, he called the wedding off completely. He then, "immediately embarked on a high-profile affair with [Kendall Jenner]. The next weekend, on what would have been his wedding day, he was partying in Vegas."
Eventually, Blake stopped paying her "full financial support commensurate with her lifestyle and her share of their joint property" and her plus their children were left homeless.
"While Griffin is continuing to earn millions from his NBA and endorsement deals, Cameron and their children are homeless and cash-strapped," the suit states. "In Griffin’s absence, Cameron’s brother has had to provide Cameron and the children with financial support."
Brynn has noted that his actions were "cruelly embarrassing his family" and she calls him a "hard-partying man-child" who she did "everything" for.
"Griffin abandoned his family because he cared more about the glamour of being a Hollywood celebrity than being a father and family man," the lawsuit reads.
Brynn is suing for millions of dollars, although the exact amount is not known for this time.