Husband Cheated

My husband is a good man. He provides for our little family, and he has a huge heart for everyone. We've been together for over 6 years, and I know this man's pattern of behavior like the back of my own hand. Lately, I noticed he had fallen into a similar negative pattern of behavior. His temper was short, he would go through periods of elaborate gift giving, he showed low self-esteem by negatively talking about himself, and he was emotionally withdrawn. Each time he has shown these signs he has committed an act of adultery. Not physically cheating, but sexting with people from the Craigslist personal ads, on dating websites, or from back page (a prostitution website that I am familiar with after working with human trafficking victims). He has had issues with honesty and being a compulsive liar since he was a child (a learned trait from his parents), which makes him nearly impossible to pry the truth from. I have gone through this truth prying process, a process that takes on average 1-5 hrs, with him roughly 7 times in the past 2 & 1/2 years. Last night I confronted him and begged him not to make me put both of us through that. He reluctantly gave up the fact that he had indeed done something of the cheating variety. I did not pry for details, I did not yell, I simply went to sleep after he said this. After waking up this morning, I simply do not know what to do. I don't feel angry, I just feel numb. Next step, marriage counseling or individual counseling for him? Is this a we or a he problem? Considering the amount of times he has done this, it's hard to tell whether or not this my fault or his. I am a counselor, and I have attended counseling on my own in the past. So should I book an appointment for one of both of us?