I can't imagine the anxiety this puts you through.
I want to offer you another perspective. While you shouldn't have to live with infidelity, many folks survive this situation, heal and even improve their marriages.
It doesn't always start with force and boundaries though. It's important to assess what your H is getting from this situation other than what he has at home....what is so darn appealing about the OW(s)? Before you dash off the freedom to do as he pleases answer and extra sex answer.....ask the hard questions? What's the 400 lb gorilla in the room that no one talks about?
For some it's body issues, for some it's money, status, for some it's children, for some it's time and how they feel about themselves.
Ask yourself what has changed since you were the point of attraction?
sg Love is PATIENT, love is KIND, LOVE never fails / DB since 2001