I am unclear on your question. If you are asking whether you are divorced from your ex-wife simply because you have not seen her for six years, the answer is likely no. You need to go through the divorce process. You should probably speak to an attorney about your specific situation.
Nothing in this communication should be considered legal advice. Nor should this communication lead you to believe that an attorney-client relationship has been created. Only after thorough analysis of your case with you in my office can I provide effective legal advice on your specific issue.