Led Zeppelin - Babe, I'm Gonna Leave You Lyrics Meaning

i think this song is about a man who is in love with a woman who cheated on him with another man, and he just cant get over her even though she cheated on him. towards the end of the song there is a dramatic part (5:24-5:53), and if there was a movie or short film from this song i can just imagine the guy trying to cope with his obsession but he cant so he puts a gun to his head and pulls the trigger @ 5:53. a little dark, but its a theory- a complicated one.