IB, please don't let his words take away the strides you have been making.
Remember he is in crisis. He is trying to find a way to fill the hole he feels. He needs to walk this. It's best if you just continue to stay out of the way.
While I know you want your children to be able to confide in you and come to you with their feelings, it might be best for you to tell them again that what is said between them and their father should be kept between them.
And to say that we all should find happiness and you hope he finds his.
Sweetie, he has to learn on his own that happiness doesnt come from the outside. And you need to let him.
You, on the other hand, are learning things about yourself, finding your strength, becoming who you were meant to be.
And push throught the emotions if you have to right now.
Keep going. Dont forget to live YOUR life, the amazing, wonderful live you envision.