Jay Mohr was serious about sticking with Nikki Cox ... even though he filed divorce docs, he now wants to drop the whole thing.
Jay filed a request for dismissal Monday in L.A. -- just 6 days after the divorce petition. As we reported ... Jay told us last week he and Nikki are "Very in love. Very happy and that's really all there is."
It was clear they were trying to work things out, and a source close to the couple tells us there was a "full reconciliation" over the weekend.
The dismissal also covers Jay's emergency petition to get full physical custody of their 5-year-old son.