I'm reading the OP much differently than both of you are. I don't see any intent to immigrate to the U.S., then or now. The first time it seemed to be simple ignorance of the fact that the US Embassy looks at ties that will cause you to want to return from where you came. This second time, I think there's some missing punctuation:
Fast forward 6 years I have a British passport, married and a job so I really 'want to live in the US.
OP, do you need another quotation mark at the end of that sentence? I read it as: I'm established. I live here in Britain. I'm married. I have a job. So, like, yeah, I'm really going to try and move to the U.S. and leave this behind.
But given that there was a visa rejection in the past, you do need to sort this out.