"People have such a childish view of monogamy and fidelity. 'He's cheated so he's bad, she's cheated so she's bad,' as opposed to a recognition that our species is not monogamous," he explained. "To act all indignant, that your world has been rocked because your lover wasn't faithful to you, is a little bit like acting rocked that your hair went grey."
He says that he is committed to his current wife but didn't say that commitment equals fidelity. The guy is a jerk and I'm not sure what you expect from a guy who has sex with the nanny along with a bunch of other people and ends up marrying the nanny. I'm always curious when I read these kinds of things if the wife is also allowed to be with other people. I'm guessing the answer is no and that it only applies to Ethan Hawke and if his wife did something he would leave her in a second.