Spaced - Season 2 Episode 6

Marsha still thinks that Tim and Daisy are a couple, and when she sees Tim kissing and flirting with Sophie, she gets suspicious. Later that night at Daisy's birthday dinner, Marsha tell Daisy that Tim is cheating on her, which Daisy replies with the truth about their relationship. Marsha, humiliated after realizing that she's the only one who didn't know the truth leaves the restaurant and moves out of the flat.