Ramblin' On My Mind lyrics

I got rambling, I got rambling all on my mind.
I got rambling, I got rambling all on my mind.
Is to leave my baby, 'cause she treat me so unkind.

I'm going down to the station, catch that old first mail train I see.
I'm going down to the station, catch that old first mail train I see.
I got the blues 'bout miss so-and-so, and her son's got the blues about me.

I got mean things, I got mean things all on my mind.
Lil girl, lil girl, I got mean things all on my mind.
Is to leave my baby, 'cause she treat me so unkind.

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What do you think is the meaning of Ramblin' On My Mind by Eric Clapton?