Hi David.
Food for thought.

"Weren't the first, Ain't the last". That sounds fine.
I had another listen to the "deceive" and it sounds alright to me but the V in "leave" I think could be boosted.

Your questions about the story I think you provided reasonable answers for them yourself and there are others
that could be used, such as:
the singer and his friends were in a touring band and the girl was known to one or two or even more of them so I will leave that to the listener's interpretation. Mackie would probably have a different answer.

I am pleased that you were interested enough to raise those questions and thank you for listening and taking the time to comment.

Vic