I have to say I agree with both Kaffe and Snodderly. The trick here is to figure out what "friends" means. In my case I keep conversation to email and text. Mostly so I can keep it recorded but also because the spew is more than I'm willing to accept.
What does friends mean and what does your reponsiblity to your kids mean? Those are the questions you need to figure out.
What it means to him? That may change with the wind for all you know. Your boundaries are what you control. Your emotions.
Your expectations must remain at zero, but you can still be friends. It starts with friendly. It starts small and has many repeats in this situation. But you'll be glad for that advice later.
He won't likely always be this way. This is temporary in the scheme of things. They have a way of remembering things differently later Be the light and be the boundary setter. Be firm but kind. There is no reason to do otherwise regardless of his actions. You'll be glad later... AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."