A husband and wife going through a rough patch take a break with divorce looking likely. No infidelity from either side, just a mismatch in temperament and interests. The wife's sister plays a part, I believe, but I can't remember how she figures in. Anyways, they split up with the husband traveling to the coast to go fishing, but the wife meets up with him there and they patch things up.
I for sure thought this story was by Jay Cantrell but I couldn't find it on my computer or on his page.