Yes it is a very difficult path for you now that H is in MLC and flitting around Fantasy Island with the OW. Which is why we urge you to curtail in sharing details about your life with H. He is not your "best friend" at the moment. Treat him as you would a work colleague...on a need to know basis.
I recall when my XW would go off on her own or not share details with me during my MLC...it annoyed me and certainly piqued my curiosity as to what she was up to. Something for you to ponder over in your corner.