You would first need to divorce. Once your divorce is final, you can remarry. However, your L-2 status will terminate upon operation of law immediately upon your divorce being final. You will begin accruing unlawful presence. You may marry the U.S. citizen while in the country and pursue a green card. USCIS will effectively forgive your being in the U.S. without status but it can be risky if things do not work out as planned. You can read more about family-based green cards at http://myattorneyusa.com/adjustment-of-immigration-status.
Answered on Jan 09th, 2017 at 3:45 AM