Your husband has clearly disrespectedd you in many different ways. For a man to hurt his wife in this way and then repeat it again and again is horrible. Nude pics to a "friend" ? No. This is unacceptable and I can only tell you what I would do and why.

I learned a long time ago that for 28 years I rebelled, but I never gave a consequence. My EX knew I was unhappy because I voiced it again and again but nothing changed. Rebelling wasn't working. Give him a consequence for his actions and get this handled once and for all. Personally, I don't know how you've dealt with this, and can't imagine you two ever getting through this. However, if you love him and think things can be worked out, then try the consequence theory. In rebelling you simply send a message that says "I'm unhappy and I want you to know this. I don't like this one bit." So he doesn't seem to care about your feelings does he? He continues. Try this: "Sweetheart, I've made a decision. I have reached the threshhold of my tolerance for disrespect. I will not be treated in this manner and I will not allow you to hurt me and my family any longer. If you want your family together and your wife the way it's supposed to be, then cut all ties with this woman NOW. ALL of them. If you don't, I will file for a divorce. Bottom line. Now, this sends a message to him "hmm.... she's serious this time. What if she leaves? Hmm... I better straighten up or I'm going to lose her and my family will be broken." I bet he gets rid of her for good. I hope so. If he does, then that's wonderful but don't take it for granted you can trust him. If he refuses, do what you said you would and file for a divorce. Stand your ground and do not ever let anyone treat you any way that makes you feel insecure, unhappy, or sad. This, of course, is my oppinion of this problem and what I would do, and is just food for thought. I'm so sorry you're having to deal with something like this. I've lived through it, it's not fun, and rebuilding trust is the hardest thing you can ever do. It will make you or break you but nothing is worth living in misery. I got out of mine and am happy now. I'm writing, dancing and living. It's been 9 years, he's remarried and I'm single and loving it. Time was my friend. Good luck to you.