Sentence "But I living, living me behind"

[Vaok]

Should auld acquaintance be forgot,
and never brought to mind?

Should auld acquaintance be forgot,
for the sake of auld lang syne.

If you ever change your mind
But I living, living me behind -- what does this line mean? thanks!

[Mister Micawber]

I don't think it has any meaning. It is not a part of the traditional song, 'Auld Lang Syne', and if I google the phrase, it appears only on Chinese websites.
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Native English teacher at Mister Micawber's