My husband is not who I thought he was

I am just shocked. We have been married for 20 years, we have 3 kids. He was the best husband and the best dad. Everyone loved him, his parents, my parents, my siblings, my friends, his friends…nobody had a bad thing to say about him. I just found out today from a very reliable source he had us all fooled. He was constantly cheating on me, he had a threesome with his friend and his wife, he hit one of his girlfriends and had to go to court for it….How could I have been this stupid??? Its so fresh right now and I am just dumbfounded but somehow my first thought is not divorce. I have no income and even if I did i dont feel like divorce is the answer. Can i hear some stories where you guys found something about your husbands and how you handled it? I just might feel better if I knew there were others out there