The New Adventures of Old Christine (2006)

S1E13 A Fair To Remember

Christine decides to lend a hand at Ritchie's spring carnival and unexpectedly encounters the snarky moms, Marly and Lindsay, who are gossiping about the handsome father of a new student at Westbridge. Her excitement peaks when she discovers that the charming dad is actually her former boyfriend, Burton. However, her hopes of rekindling their relationship are dashed when she finds out that Burton is now dating someone else.