Think of this as being no different than something with a drug, alcohol or gambling addiction. IT'S THE SAME THING -- your husband is involved in addictive behavior that is HURTING YOU EMOTIONALLY. He needs to get TREATMENT for that (from a good IC or family therapist who specializes in infidelity and sexual addiction), and he needs to PROVE TO YOU, to YOUR satisfaction, that he is being treated for that and it's safe for you again to re-invest into the relationship.
The burden for that is on HIM, not on YOU, and until he can do that, you need to protect yourself -- legally, financially and emotionally.
And a good full-panel STD test, if you have had any unprotected sex with him in the past 12 months, is imperative as well.
