When it's over, it's over...addiction or not. It is not so much the circumstance you are involved in, it's how you handle it.
With that said, if you want out, devise a plan, write it out, tick off every step that you have accomplished...the plan can be a two year plan, it is not a matter of how long it takes to accomplish the plan, it's just a matter of accomplishing the plan.
Do what is best for you and your children.