You need to sit down and work out what you want. Rate it in priority (also consider how likely it will be- i.e. being best buddies appears unlikely based on this guys past behaviour and how he makes you feel) and start working on it.
InMyPlace, I agree with some of the things you posted. i.e. she really needs to work out what she wants.. which i think is that she wants to be separated but have an amicable relationship with H so that D is happy and gets to see her daddy based on her past posts. (of course more that amicable would be good.. i.e. small talk involving some light hearted banter- but we can't hope for everything.) but IMP i am wondering if you've read all Casey's posts. Maybe casey needs to explain the summary of the break up again, and the recent things he's done to cause her to not want to spend any time socially with him as I understand that going back and reading all the posts is time consuming.
in my opinion this guy is not quite right. he seems not good at putting anyone else ahead of himself and appears to be a terrible communicator. he seems to try and manipulate the situation by getting angry or grumpy or sad whenever things don't go his way so Casey backs down and gives him what he wants. so apologising at this stage would not be good. plus i'm also confused, what does she need to apologise for? yes, she's being a bit wishy washy at times, but at least she tries to communicate.
anyway, I'd love to hear a bit more from you IMP once you read some more of the postings casey has posted or you get an update from casey herself with a summary. doesn't have to be long casey.
