It's often enough been said that just because a song is written in the first person doesn't mean it's necessarily a personal statement, any more than would be true of a short story or a novel. Charlotte Bronte wasn't actually Jane Eyre.

Writers use their own lives and relationships as material, along with the lives and relationships of other people. Sometime's there is a strong autobiographical element in a song or a story, but it's not safe to extrapolate from that in a too simplistic way.

And I can't see how it's too important. I'm interested in what Dylan has written, and in what he has sung, but I'm not sure I'm that interested in what he hasn't written or sung, and I can't really see how it's got much to do with us.