this time the keith path its pretty much done already, even if bakarina tries to do something to mend it, after so many years, it wouldnt be reasonable to him just to forgive her just like that.
keith has to hate her all the way to the end, any development with him liking her would feel forced, maybe to able to tolerate her, cause people can change, but not to like her
a broken relationship its waaay more dificul to fix than a nonexistent one