As long as it wasn't in a moment of anger that you made this decision, it sounds like you've at least reached a point of some clarity, sthelen.
Please let us know how we can continue to support you through this. The only advice I would have to you at this point would be to try to treat your husband with civility and grace and even FORGIVENESS, as you never know what the future will bring. It helps if you look at it as an addiction, for which he someday is going to need to get some help.
In the meantime, just maintain -- and enforce - your boundaries.