I’m American and recently bought a house in France. On July 17 I traveled from USA to France. On Oct 10 I returned to the USA (to make sure it was less than 90 days). Leaving France the border agent asked me when I last entered, and pointed out my last stamp was from February. I checked and this was true, but he believed I entered in July (which is true), and let me go. My question is, can I return to France before waiting three more months in the USA? Or is there electronic record I was there? We are waiting for my livret de famille but with COVID it might take months and I want to return to my husband and home.
There's no electronic record, so indeed, if you never got an entry or exit stamp for a specific stay, then that stay essentially "never happened".
As such, you can safely return to France without delay, even with the COVID-19 restrictions since you're the spouse of a French citizen.
However, if arriving directly from the US, one normally needs a negative COVID-19 test taken within 72 hours of entry. Not sure whether being the spouse of a French citizen exempts you from that.