The title suggests someone who is not quite able to bring themselves to say, “I love you”, and in this episode, both Lorelai and Rory will have to face up to their commitment issues.
The title may be reminiscent of the song PS I Love You, a 1934 popular song written by Johnny Mercer and first recorded by pop star Rudy Vallée. The Beatles had a 1962 song of the same name, the B-side to their debut single Love Me Do, and included on their 1963 album Please Please Me.
The Annotated Gilmore Girls 