Season 3: Episode 47: Stuck Together, Torn Apart
Lois runs into an old boyfriend who invites her for coffee to catch up and she reluctantly agrees, not telling the jealous Peter where she's going. With the help of Joe's new surveillance police van, Peter hears and misinterprets their conversation at the diner. Ever jealous, Peter goes on a quest to find his old girlfriends. The misadventure leads Lois and Peter to marriage counseling where its suggested they do a trial separation. Lois ends up with Quagmire, Peter with Jennifer Love Hewitt. Meanwhile, Stewie and Brian accidentally super glue themselves together at the store and have to wait a week before the solvent arrives. Together, they actually begin to like one another.