US Immigration from Sierra Leone

Hello everyone,

I will be filing for my current fianc when we do get married hopefully at the end of the year. I have been married before, and I sponsored my ex-husband, but I don t remember date that we submitted the adjustment of status (AOS) application. There is a question on I-130 that asks whether you have sponsored someone before and asks to provide the date. I remember the month and year, but not the exact day. I have pleaded with my ex husband to provide it to me, but he denies having it which I think is a lie. Our marriage ended bad because he didn t want the divorce even though he was unwilling to make the marriage work for me. Has anyone been through a similar situation? If yes, what did you do to overcome the issue?