Asked in Divorce
You have multiple options in the matter but on priority basis You should take assistance from the Police, your marriage is also.not valid.
Nikahnama is not valid because you are Hindu and He is a Muslim .You both should have married under special Marriage act. File criminal Complaint against him take assistance of any Advocate in this Forum for your relief.
On many grounds you can file divorce but registration if marriage is not compulsory.
You are asking for legal help, many options are available to you, but before moving ahead with your query, I would like to ask will you take any step (harsh) since your parents are not aware of your marriage instead nikah with the Muslim guy. I suggest you take your parents in confidence and consult me or any other lawyer of your choice to take a legal step against the said person who is ruining your life.
This is not valid marriage. Rather by force getting any thumb impressions doesn't make any contract valid. So you can file a writ Petition CRIMINAL in the High Court for police protection incase he invades your privacy. Book Consultation for further help.
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