If you don't remember this sitcom, it's probably because it ran for only 13 episodes in 1977 and '78. I haven't seen it since then, it doesn't seem to be available on DVD, and there are no clips from it on YouTube. I found a few photos of the two stars, but that's all.
I remember it fondly, though, probably because one of my favorite character actors, Oliver Clark, got to play one of his few leading roles. Clark was Mr. Herd, one of Dr. Bob Hartley's patients on THE BOB NEWHART SHOW, and Beverly Archer played supporting roles in many TV series during the Seventies and Eighties. You may recognize their faces even if you didn't know their names. In this series they played a married couple where the husband had some sort of job where he worked at home (I believe he wrote copy for a sporting goods catalog or something like that, but I could be 'way off) and the wife worked as a photographer's assistant. Another great character actor, Tom Poston, played the photographer. The show was created, written, and directed by some of the people who worked on THE BOB NEWHART SHOW, and I remember the episodes being pretty sharp and funny in the gentler, subtler way that television had back in those days. WE'VE GOT EACH OTHER didn't run long enough to achieve any sort of greatness or even leave much of a mark at all, but I liked it.