It's a Living S02E08 - Jealousy or Mildred Fierce

Chef Dennis has been quite depressed lately as his wife Mildred has just left him for being "dull."  After dinner service that night, he and the waitresses, along with Nancy, discuss his situation in which the girls come up with the idea of having Dennis date a woman in front of Mildred at the restaurant that she frequents often for lunch so that she'll get jealous and return to Dennis.  Dennis agrees with the idea and chooses Cassie as his date over Nancy.  The next day, Cassie and Dennis have their date at the restaurant in question and he spots Mildred at another table with her date, who turns out to be Mildred's hairdresser (not the young man that Dennis saw her with days earlier).  After applying her wiles at Dennis at their table, Cassie sees that Mildred's interest has been peaked and tells Dennis to go over to Mildred's table and have it out with her.  He does, but he returns to his and Cassie's table with a plate full of linguini and clam sauce spilled all over his person (Dennis then tells Cassie that Mildred just told him that she is filing for divorce). 

After not showing up for work at Above The Top for three straight days, Nancy calls Dennis at his apartment and threatens to fire him if he doesn't show up for that night's dinner service.  While discussing Dennis' plight amongst each other while setting up the tables, Cassie, Jan, Dot and Maggie agree to go to Mildred's mother's apartment after work (Mildred is staying there temporarily while she's preparing to file her divorce against Dennis) so they can talk to Mildred and save her and Dennis' marriage.  All four ladies try to reason with Mildred, but to no avail (Cassie and Jan have objects thrown at them by Mildred, which hit the inside of the apartment's front door).  Dennis then shows up at the apartment and tries talking to Mildred; he, too, fails.  Later at Dennis' apartment, Nancy show up and apologizes to Dennis for her behavior over the phone while using her wiles to seduce him (Dennis is oblivious to this while looking at his old high school photos).  Just then, Mildred shows up at the apartment and catches Dennis and Nancy sitting together on the couch and leaves.  The following day, Dennis comes back to work at Above The Top and explains to Nancy, the girls, and Sonny that he and Mildred have talked things out and are both back together again, which slightly embarrasses Nancy, causing the restaurant to return to normal.