You are eligible for citizenship within 3 years only if you are still married to your wife who, presumably sponsored you for the green greed. If however you divorce her within 3 years of Sep. 2012, you can still file for citizenship, but then only after 5 years of Sep. 2012. If you divorce her now, it will be a wise thing for you to keep and retain as may documents as possible that attest to the bona fides of your marriage. If you opt for the N-400 within 5 years, a natz examiner may be inclined to ask questions regarding your marriage and divorce to ensure that your marriage had not been entered into solely to avoid immigration laws. You should really consult with an immigration attorney nonetheless
Answered on Jan 21st, 2013 at 7:10 PM