And Mallory Ortberg is perfect.
Dawn, listen to me, listen. I love you. I will always love you. The highest moral purpose is the achievement of your own happiness. And this is the work that I have to do. Any action that a man undertakes for the benefit of those he loves is not a sacrifice if, in the hierarchy of his values, in the total context of the choices open to him, it achieves that which is of greatest personal (and rational) importance to him.