From my little understanding through my own experiences, you need to collecting as much evidences of your relationship and commuincation as possible. As long as you two have met once within the past 2 years, you shouldn't have problem. But again, the more the better. The stronger the better. To the bottom line, ask yourself if you are a VO, would you believe your relationship in a common sense?? fix anything that might cost delay on your positive answer.