How to get a guy to leave you alone?

[David]

invite the police over to have a chat with him
let them tell him that he could be arrested for stalking
they should tell him that he should never come to your house again
he must get medical help as his actions are that of a person about to commit suicide
you have to be very careful because he can harm you if he sees that he will never have you as a partner
the police should take him to a doctor immediately so that they can decide if it is safe to let him mix in public with normal people
in future, avoid helping people especially if he is a guy
you do not seem strong enough to get people off your back
discuss with uncles to come and stay with you temporarily for protection until for some months until you are sure that the guy will never come to your house again