it is not place to judge someone's faithfulness. Depending on the age of the men of your family, i'll assume that maybe their relationships with the women in your family havent always been picture perfect, however, they decided that staying together and working it out was more important. You picked that as a starting criteria for a man's role and then based it off the men in your family.
Again, i ask you to make the distinction b/c due to certain job dynamics, its possible for the woman to earn more than the man. Does that lessen his "provider" capabilities by your definition? In the other thread, you mentioned that a man has to make 1.5x more than you or that you would ideally like for him to do that. I cant remember, but my point is, if he is contributing...you dont have to force him get a job, he never complains about work, he might take on a side gig just to bring some additional income in the house, does that still satisfy this definition of fulfilling his duty that you've stated here?