He's begging her not to leave with the boys, promising to resign from his job and work on himself and his anger management issues and devote himself to making himself the man he knows he could be…
Celeste has heard it all before.
Now that the violence in their house is affecting the boys, it's time to split.
She know that it's never going to change, and that there's no containing the violence.
They talk in the car outside Trivia Night, Perry apologizing and Celeste weirdly calm, until Renata taps on the window.