The last sentence made me laugh.
I think you are too intertwined with him and a little piece of you still thinks that you can say something that will get through. I hope you don't respond to him, because he will never understand the logic. WE know that yoga is something you're doing for yourself, which is brave and amazing of you, but you're also doing it for those around you, including your kids and including what's-his-face, because you are a caring and conscious person who has the inner beauty to see her impact on the world around her.