Skye - You really are in a bit of a dilemma... i agree with Shell, give it the month (sounds like you would have to any way) and spell out to him one of the reasons that you are leaving is because of the way that he treats Jaz... this is a really big thing for her - maybe he could go to conucilling with her, so that they learn to communicate better.
TBH as a step Mum, i can tell you it is awful for the kids and if there is anything you can do to stay together, try it and keep trying, but if Anth isnt wiling to come to the party, well then you have to make that decision.
Living so far away from him will also be really hard on the kids.
Sorry, probably not very helpful hope you figure it out and its gets better for you.

Shell glad that you are getting away...have a drink for me too
i am thinking of booking the redbull airrace tickets for DH - he tas been working so hard and i know he would love it - besides it would be a forced short holiday as it is in Perth

Gotta go, MJ is stiring