If it was me I would NOT stop the proceedings.
Over the years I have been in recovery first from addiction and then from being a full blown 'codie' lol I have realized that 90 days, 120 days, 150 days, is just a drop in the bucket. Only time and the addicts ACTIONS will show you there is sincere change.
What he just used on you was a manipulation 'hook' to get you to stop the proceedings. Then in all likelihood in 20 or 30 days he will return to old behaviors.
You know that going through the divorce does NOT mean that you won't get back together somewhere down the road. It does mean that you mean business and you and your children deserve better than what you have been getting.
At the least, as said above, go for a 'legal' separation to cover yourself and the kids.
What 'he said' to me is just QUACKING. Let his actions over the next year or so show you he is sincere.
J M H O
Love and hugs,