But last month he called me from a new number and said that I have to marry him at any cost, because he have some indecent photographs of mine that he can expose and spoil our reputation in the society. So he is blackmailing me for marriage .So please help me in this regard. How to save myself from him.
He cannot do anything that way he is threatening.
In fact your father may be right in his opinion that he is just passing his time and even now he may not be sincere in his call for marrying you.
He is trying to make use of his desires to be fulfilled at least once before discarding your relationship once for ever hence he is trying to adopt some criminal steps to threaten you to budge to his desire.
If his tortures are beyond tolerance or is you are afraid of his activities, with the help of his phone number, you may lodge a complaint agaisnt him with the cyber police giving complete details and request for a proper legal action to protect your modesty and name.
The police action will certainly bring him to negotiations and he will get away from your sight for ever.