What could happen if I'm not living with my spouse while waiting for a decision to remove condition that I applied 11 months ago ?

You need to notify USCIS immediately if divorce proceedings are initiated. You will need to request the joint petition previously filed be converted to a waiver petition. You will need to provide a copy of the case opening papers. You are also required to notify USCIS of any change of address. Divorcing at this stage will likely delay a final decision but so long as the marriage was entered in good faith you will receive the ten year green card. You should work with an attorney to ensure the case is properly handled. You can read more about removal of conditions at http://myattorneyusa.com/seeking-waiver-of-joint-filing-requirement-of-uscis-from-i-751.