You are only eligible for naturalization if , at the time of both your interview and oath, you
1 Remain in a bonafide cohabitating marital relationship to the spouse who petitioned for you
AND
2. You have been a lpr for 3 years
AND
3 You have completed ROC and are now an unconditional LPR
Filed divorce papers wipes out 1.
Non yet completed ROC wipes out 3.
Without all 3 conditions being met, you cannot use the 3 yr rule
Your only path to citizenship is that you MUST complete ROC using a divorce waiver. Then you can apply under the 5 year rule.
Please fill out your timeline if you want more help.