Amadeus, whether he realized it or not, had helped Mab trust again. He had healed a little broken piece inside of her that had come with the loss of two pregnancies and the guilty, anger, and madness that had come with it. Some of the madness, the useful parts, had stayed but she no longer felt at fault for the things she couldn't control. So yes, she had parted with him amicably because he had given her what she needed.
She leaned forward, whispering in his ear, "I could take out this whole tower right now at the very least." Then she kissed the spot behind his ear before backing away. "Or anything else you might be able to think of."