The Big Bang Theory (2007)

S2E2 The Codpiece Topology

Feeling envious of Penny’s new boyfriend, Leonard finds himself in a rebound fling with Leslie. As he navigates this unexpected relationship, he tries to mask his true feelings about Penny while grappling with the implications of his choices. The situation leads to a mix of awkward moments and self-discovery as he realizes that moving on isn't as straightforward as he hoped.