I am so angry with the entire situation.
For him to look you in the eye and promise that he would stop, protect your marriage, and respect your feelings, and then sneak behind your back and lie to your face - it's foul.
I am so sorry that you are going through this. You seem like a beautiful, intelligent person, who deserves love and loyalty from your husband.
I pray that things head in the right direction for you. I can't imagine having my heartstrings pulled like this, over and over again.