the amount of time you have spent apart should make no difference in the court room unless there have been major purchases or lapses in large payments ( mortgage, credit cards etc) .. then all you would have to do is show a lease, bills in your name for another address, or in a pinch a letter notarized that says you lived with someone else for that time. That person would then have to show proof of where they lived and it has to be for as long as you claim to have been there.
Sounds complex. Really isnt.