They are together because they are broken. And they havent done anything about getting fixed. They are holding on to the life preserver because if they let go, they will free fall.
They are petrified of facing life and themselves, T. I mean look at it from their perspective. She is a hot mess and he is in a crisis.
They know something is wrong and they keep thinking it must be everyone else.
And yes, I agree, she is not going out without a fight. And he is not yet out of the tunnel enough to know that he can let her go.
But you, my friend, continue to flourish and grow. I just hope he can catch up. His problem, though.