I feel for you. Based on what you've said in the past it sounds to me like she just wants to be friends or more or less like how things used to be without the commitment of being married to you. My wife has said similar things...like one time when I said that we got along fine she said 'yeah but not like husband and wife'. So she's hinting we could be friends but no f'n way. I can't be friends with her. There's just too much baggage there and besides friends don't do this crap to friends. You need to get a bit of your anger back...she broke your family up, made you pay $$$ to her every month and now she wants you to be her crying shoulder? there's something wrong with this picture.
Good job on not calling her...now set your goal to 1 full week and as the week approaches and you feel weak set the goal to 2 weeks. Start filling your time and mind with other things whenever you feel the urge to pick up the phone. If she calls just text her back asking if there's anything important? if she answers yes then her if she says no then don't.
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again