Bluntly, I have a seriel offender, and I have enabled him.
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There are 4 one night stands, and 2 or more EA's (the current one I caught him in), he's addicted to porn, and it just hit me a little at a time (defense mechanism?).
Serial cheaters don't do well when they are enabled in any manner. They enjoy the chase, the secrecy, the fling, the pursuit and it has nothing to do with the woman. She could have been ANYONE and therein lies the problem.
Your husband NEEDS you to expose to everyone. EVERYONE!!! He needs everyone keeping an eye on him. He needs the short term motivation of shame and the long term motivation of doing better.
If he truly doesn't want to lose his marriage and family he would welcome exposure as it's the only way to possibly work things out with a serial cheater.
He also not only needs to leave that job...he needs to work with either all men or with you alone somehow. You guys need to drive to work together, eat lunch together, etc as a serial cheater can't be trusted around any female whatsoever.
This goes for the porn too. He can't have a smart phone with internet access and his computers need to be KNOWINGLY keylogged.
Reading Torn Asunder is fine. It explains, to some extent, how you got to where you are today, however, it is NOT a recovery plan going forward. You can't take bits and pieces of MB and expect it to work. We get criticized on this forum for being so demanding that people follow the program strictly but that's just because we've seen time after time what happens when they don't. I, too, have read a substantial amount of threads and posts on other infidelity forums and they are far more tolerant of do what ever you want and they also contain so many more threads titled: "He did it again" where they all pipe in to commiserate about how unhappy they are and how unreformed their wayward or supposedly former wayward husband's are today. They essentially become misery chat rooms full of unhappily married persons and angry divorcees.
You've got a VERY slim chance of restoring a EXTRAORDINARY marriage with your serial cheating husband. You can certainly half-a$$ it and likely stay married [and miserable as you constantly have to wonder what he's up to and whether you are good enough] OR you can TRY to do it the absolute only way possible to make it extraordinary.
Your choice.
Mr. Wondering