If a FIR has been registered by police, you first get enlarged in bail by applying for anticipatory bail and after that you can challenge the false case properly in the trial proceedings.
If you don't want to continue this marriage with her anymore then you can file a contested divorce case against her on the grounds of cruelty.
You can vent out your grievances from beginning in the chronological order in your pleadings in the divorce case and wherever possible you attach the documentary evidences to strengthen your case.
If you are in relationship with another person, don't rush to marry her before this marriage is dissolved by a decree of divorce through court of law.
You can continue your relationship, it is not an offence