Recovery is about hope and betterment from addiction. Relapse and failure to stick on to sobriety can easily creep in to someone who is trying to be sober by tiny instances from the family and the reactions of the family members. Sometimes the family members of the addict after giving lot of attempts to put them to recovery simply walk away.
While someone is on sobriety, the family member is always constantly watching to ensure that the addict does not slip. With time, watching becomes boring and the long duration for treatment and a couple of relapses makes the relative or loved one tired, that they want to give up helping the recovering addict anymore, because watching the addict for relapse kills time and eats up lot of their personal time.
Particularly of the spouse, feels tired of all the watching and feels trapped in to a kind of relationship that she/her never desired. Should they decide to split for those who are not married it might not be an issues, for those who are married legally, there lies lot of legal issues to be faced and that is again a boring experience.
At a point when the couple have pains continuing with the relationship, staying together anymore might mean only pain and adding up of differences that cannot be reconciled. While you are trying to walk away from your spouse or lover who is in to addiction, trying to recover and rehabilitate, you have to do so with respect and display of love, rather than affirming them of negativity.
Discuss your needs and desires and put things across in a decent manner before you part. Get a counselor to put across the reason for why you do not want to continue in the relationship anymore and quit decently. You need not shout to the roof to fix things up.