Confused

So if you have read my previous thread you will know a bit about my situation if not here is a lowdown. I am separated 9 months ago, within weeks of him leaving (I asked him to leave as he had an affair) I wanted to work things out and go to counselling but at that stage he was back out dating and didn't want to work things out. Since then I have asked him several times to work things out and a few times he was nearly considering it but unfortunately it never happened, I was always left very upset and it really took a lot out of me. After discovering he was in a new relationship, I told him in August I was moving on with my life and done with being left hanging on a string. He has been seeing this woman since June and it seems serious but I don't really know anything about it, he takes her out and about in town where everyone can see them, this just broke me and I had to make the decision. Anyway, I sent him a message a few weeks ago about sitting down over a coffee and going through what needs to happen in the separation agreement. He didn't text back until a few hours later and it was about something completely different to do with kids xmas presents... ?? He actually sent me a picture of a kids tablet?? I was a bit thrown, thinking "why wont he discuss this?".. I have sent a few more messages and each time he ignores the topic. I want to move with my life now but it's very difficult when he won't talk about what happens next. We get on very well and have a good friendly relationship for our children's sake and we respect each other but I'm actually getting really annoyed now.. Why won't he talk about this?? Any help or ideas welcomed!!