Marriages where there is physical, verbal or substance abuse should NOT be kept together.... kids or no kids. I would never recommend that someone involved with this level of dysfunction stay together.... even on this site.
I don't get the impression that Augtan is in this situation. Augtan, is your husband abusive to the kids? Is he a verbally abusive alcoholic or have drug addiciton problems that are affecting the children's lives?
P.s. My husband was "unhappily married" and in MLC for three years so I know how frustraiting, disappointing and hopeless that feels.
There is no arriving, ever. It is all a continual becoming.