Three's Company (1977)

S3E5 Helen's Rendezvous

When Stanley discovers that his friend has backed out of their agreement where the loser buys the beer, he becomes infuriated. In an effort to mend the rift between Jerry and Stanley, Helen encourages Jerry to offer an apology. However, when Helen arranges a meeting with Jerry, Jack and Chrissy jump to the conclusion that she is involved in an affair.