I'm pretty torn about this ending.
Like the actual ending, I do like. It makes sense somewhat that he got back together with his cheating wife, but I think the best way that I can say what I feel is that it is way to abrupt, not to mention it ignores things that we were shown that implies that his wife wasn't just "lonely," but that they didn't have much chemistry.
Honestly, it feels this story needs an epilogue where it's shown that they have gotten better as a couple, but even then, Im not sure that would work.
I think what Im getting at is it's kinda hard being okay with this kind of ending with how abrupt it is after spending 70+ ch not only showing the unhappier moments in their marriage, but for the mc to be surrounded by a harem that not only understood, but actively helped him become a better lover, even if it was due to a charm made by the goddess who misunderstood his request when he got isekai'd.