In my opinion, the affair and wife in this dream are actually you alone. You played two roles in his dream, which may just explain your role in his real life.
You who are having an affair: He loves you, but he is still attached to the good feeling when he first fell in love with you. I guess there is a stage when you are in love that you should meet once a week? )
You as a wife: Although he symbolized this "wife" in his dream, he didn't specifically point to who it was, but I think it should also be you. This may explain two problems: 1, your married life is too dull, and he slowly classifies you as an obedient (usually you may be a reasonable and good wife who listens to him) wife with no interest. He is trying to avoid the fact that marriage is boring. He can't see who his wife is, but it's actually you, but he won't admit it. )
Judging from the dream of an affair itself, the heroine is you, which means that he loves you very much, and there is no affair object in his life at present. His dream lover is actually a kind of dissatisfaction with his existing life, and he wants to start a more interesting life again, just like when he first met you.
So you can see his inner needs, and you should work harder to make you two live your sweet little life happily.
Bless you! ! !