Which is why Don gives her the $1 million after Harry says to him, "She never should have quit her soap and moved out of New York." He knows that part of it is his fault.

Not buying the other part of the equation though. Megan married Don with her eyes open. She knew about his past and who he "really was" (as in Dick Whitman). They tried to make the marriage work, and it didn't. Yeah, Don is a big reason for that, but when she told him she wants a divorce, he isn't petty at all. And then he finances her throughout the separation, and writes her a check for $1 million. That at least earns a "Hey, my imbalanced mother had the movers take all your furniture. Don't worry, I'll send it back."