http://www.visajourney.com/timeline/profile.php?id=32812Your profile just shows AOS approved, have you lifted conditions yet?
If legally separated, but not divorced, and US citizen chooses not to jointly file the I-751 to remove conditions, you will have a hard time removing them on your own.
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Filing if the Couple is Separated
More troublesome is if the couple is still married, but separated or otherwise not getting along. With limited exception, as long as the couple is legally married, it is necessary to have a joint petition. Thus, troubled marriages often need either to be reconciled or terminated in order to file the I-751. As explained below, the I-751 can be filed by divorced individuals, and may be approved, as long as there is sufficient evidence that the marriage was genuine when initially entered into. It is more difficult to satisfy the USCIS in such scenarios, however.
Joint-Filing Waived in Limited Cases
There are two situations in which a person who is still legally married can file the I-751 without the spouse. The first is if the person entered into a marriage in good faith, but has been battered or subjected to extreme cruelty by the petitioning spouse. The second is if termination of permanent resident status and removal from the U.S. would result in extreme hardship to the foreign national. Extreme hardship is a high standard and can be based only upon conditions that arose after the conditional residency was acquired.
http://www.murthy.com/news/n_remcon.html