Give him the minimal information necessary. Be cordial and kind but don't elaborate on any conversation more than required.

Also, are there any hobbies or interests you have always wanted to pursue? Things you set aside with the business of your married life? Try them out now, even if it's as simple as learning about a new subject or a how to book of something you've wanted to try. Fill your time up with things that bring you joy and you will think less about him and feel better about yourself without consuming your day with thoughts that won't help you. Are there any friends you've lost touch with? Go and have a coffee with them on a nice patio, talk about things completely unrelated to your situation. Ask them questions about how things are with them, it's a great way to learn about people and how we are all different. Think like the french, its a way of life sitting on cafes outside and discussing life and random things, we are inherently social beings and human interaction is built into who we are. Get your mind off of him as much as possible. Once he sees you seem to be getting along nicely without him he will start getting the feeling that you dont need him. In the end you are doing it for yourself.