Dear Sir, Please note that recently Bigamy has been stuckedoff from IPC.However if an FIR has been registered for Bigamy and Cheating, you are only a victim and seeking punishment of the accused if its been proved beyond all reasonable doubts.
Hence you need to file a case in competent court for divorce on the ground of bigamy and also file all the criminal cases pending against then accused.
Then the civil court after due trial may pass a decree/ judgment of divorce, then after the lapse of appeal time, you can re-marry.
Regards
Balachander Reddy
Advocate
9959850723
Hyderabad