CBS

Season 5: Episode 21 - Twin Beds

Twin Beds: When Don asks Robin to move in with him she feels it is time for him to meet Ted and Barney.  Marshall and Lily go on a weekend trip to a bed and breakfast and the only room available is the "Fishin’ Buddies" suite which has twin beds.  They have a fantastic night’s sleep and decide to get twin beds at home. Lily becomes concerned that they will grow apart when she learns that separate beds caused Don and his now ex-wife to drift apart.  Just when she thought Marshall wanted to keep the separate beds she wakes up to him cuddled up in her twin bed.  As Don discovers and learns to accept that Robin's best friends are her ex-boyfriends, Barney and Ted each decide they want Robin back now that she is getting serious with Don. However, both realize they are just jealous that she has moved on.  Robin decides to move in with Don and take a break from Ted and Barney so she can give this relationship a real chance.