that's the most acceptable and valid reason to leave your partner.. damn.. glad it was not because of toxic reasons at this point im wishing all of them happiness ╥﹏╥
I'd recommend reading from the beginning as the novel has details and story depth the manwha doesn't cover, but if not, start the novel at chapter 83 where the last chapter of the manwha season 1 ends.
i'm ugly crying right now god damnit