I think you need to make that decision. If he has fallen back into his old behavior (or if he has covered up the real truth......not just "his truth" all these years) you said you didn't want to go through it again.

He DOES have problems with alcohol (he will always be an alcoholic), and he lies, and he tries to keep a hidden life on the side of his married life.

You asked if he is going through a second MLC? No! IMO, he has been deceiving you and now it's catching up with him AGAIN. That is why he's angry.

It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!