I am glad you are there for your kids. That's very important. They will never forget it. I can say I have become a lot closer to my S through all this junk.
There's an adage around here - believe none of what they say and 50% of what they do. One thing to keep in mind is your H is doing a lot of self-convincing to justify where he is emotionally. He may look at you when he says these things (e.g. I don't love you, I only want to be friends, etc.), but there is a chance he's talking to himself.
Don't beat yourself up about backsliding, either. Just learn from it and move forward. All of us backslide from time to time around here. We're human.
Bummer about your art class being cancelled. You have more things lined up, though, to look forward to.
