Hello WillyA: I'm afraid this is such a complex situation it's going to be difficult for anyone here on PC to give a very comprehensive reply to your post. If you do not already see a therapist of counselor, I would recommend this. You need to establish a relationship with a professional who can help you to figure out what you want to do.
Unfortunately, it does sound as though your husband does have some sort of sex addiction. And these sorts of things can be very difficult to break. And also, from what I know of it, the lying & hiding are pretty typical. Your husband definitely does need treatment. However, whether or not he is serious about seeking it remains to be seen.
You are going to have to come to a decision with regard to whether or not you are willing to stick with him one way or the other. Perhaps he will get into treatment & overcome his addiction. Perhaps not. There's not going to be any sure-fire way to know which it's going to be until you get further down the road. Either way, you're going to need some support & someone to help you figure out where you need / want to go from here.