#1, They should have had him step down from all positions of leadership.
#2, They counsel, pray and talk with him.
#3, If he refuses to end affair, they admonish/warn him.
#4, If he still refuses, they excommunicate.
And frankly, Olive, it embarrases me that so-called "men of God" don't have the moral courage to challenge your husband and protect you and your daughter. They are supposed to be the fathers of the church.
I suppose he gets to parade his mistress in church once you are divorced?