Hi
The supreme court has ruled that Unmarried couple is living together as husband and wife, then they would be presumed to be legally married and had said continuous cohabitation of a couple would raise the presumption of valid marriage and it would be for the opposite party to prove that they were not legally married.
"It is well settled that the law presumes in favour of marriage and against concubinage, when a man and woman have cohabited continuously for a long time.
First file a FIR U/S section 342 of the Indian Penal Code in your nearest police station at Delhi.
Please note that you should vividly describe the following elements which are necessary to prove Wrongful confinement
1) Wrongful restraint of a person or total restraint or complete deprivation of liberty without lawful justification.
-in your case, you should cite your live in relationship which the supreme court has declared as legal.
Hope this helps.