There was good advice on this issue before people started addressing the wife, but not much afterward. There is surely a good aspect of not confronting the husband and shaming him. But keeping quiet is also not the answer.
The fact is that great people can have great taavahs and nisyonos. Even if one succumbs to them many times, that person can still be a great person, although not exactly in the straightforward way. There are two paths to greatness, one as a tzadick, and the other as a baal teshuva. And often times, teshuva is a never ending continuous process and struggle.
The ikkar is that the wife needs to look into his soul. Is the husband a complete faker? If yes, then it is best to leave him. Does he espouse righteousness, but secretly feels absolutely nothing for it. If he is a complete faker, a closet apikores, leave him.
If however, the husband has nisyonos and wants to be good, but aino yochol lichvosh yitzroh, then the wife needs to cry along with him and share his burden. If his heart and soul is good, tell him you understand his difficulties and are there to support him in any way you can.
To confront and shame him is wrong!
To keep quiet is wrong!
No, you did not ask for this burden, but it is yours nonetheless.
Step up to the plate and be there for your husband!!!
That is your nisayon!
Will you pass it?