This site covers the original British Beatles Albums plus analyses of the lyrics of non-album tracks.
Beatles Single: Get Back: side B
Lyrics: Lennon, McCartney
The lyrics of Don't let me down were written by John Lennon and are a plea for his new love Yoko Ono not to abandon him.
The subject of being abandoned and rejected have been written about many times by John Lennon during his time with the Beatles.
Although appearing as the B side to the get back single it was not on the original Let it Be album; it was included on the re produced let it be naked album.