Can I sue an ex for sharing my nude photos without my permission?

Well, you may…  the law has been a little murky with nude/intimate photos.  Particularly, when it comes down to whose property the photos are and what the owner may or may not do with them.  For more in-depth commentary, you can read a blog I wrote on the subject last year http://carpentermcleod.com/revenge-porn-a-whole-new-disgustingly-creepy-corner-of-the-internet-opens-a-new-legal-arena/.  However, in my opinion, particularly depending on how the photos were “shared” with him and what he is captioning with these photos when he, for example, shared with his cousin, you may just have a case for defamation.  Or, you may be able to argue that the photos were “shared” with limited rights of use that you revoked upon termination of the relationship.  This is a pretty new legal arena, but I’d suggest meeting with a defamation attorney to discuss the details in a confidential environment.  It may costs you a fair bit of money to litigate, but that could very well be worth it if it solves the problem.  Many attorneys will offer a free consultation, so at least you will have a good understanding of your options available to you.