Hi

The Indian Penal Code, 1860 / Marriage ceremony fraudulently gone through without lawful marriage.
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Whoever,
dishonestly or with a fraudulent intention, goes through the ceremony of being married, knowing that he
is not thereby lawfully married, shall be punished with imprisonment of either descripttion for a term
which may extend to seven years, and shall also be liable to fine.

You can complain to the Police or file a private complaint before the Magistrate.
or file suit for damages and get compensation in a Civil Court.

The girl can complaint to police about the person who all involved to stop the marriage

That is fair enough. Any idea what will happen if a man is blackmailed and threatened not to think about prospects about marrying anyone or else they will bankrupt him by withdrawing their capital, fire him from employment, break their friendship, defame him in public etc. No girl friend involved.

if then he can lodge complaint against the stranger to police