I'm working on that and you're right, it can't be fixed overnight. [For the first time, he is giving himself space to sort things out. He isn't expecting an epiphany or a simple fix; he is expecting to regain his stability.]

You don't need to be scared of me. I would rather skewer myself than hurt you.

All of my stupid ideas about you and Obi-Wan are gone and I know the problem is with me. Watch me day by day and I promise I won't disappoint you.

[Part of this is showing her he has changed, but only part of it. The majority is him wanting to find himself again. He wants Vader to die; to cease to exist, but such a strong force isn't easy to suppress.]