Sounds like it'd be an excellent decision to excise this person from your life, but without a lot of details its not easy to say how to go about this. From what you say, you're not married or in any other formal relationship with him, and he's merely an acquaintancwe that has made himself a nuisance. If so, then just say NO --- tell him that you find this relationship is increasingly negative and unpleasant for you, and you would appreciate it if he made no further contact with you. And maybe add that if he persists in intruding on you, you will seek further legal and police advice and obtain a restraining order which would forbid him from contacting you at all.
Debate and discussion would probably be fruitless. If the person has shown any signs of physical violence or the potential for that, it might be best to start by contact a group which advises abused women, such as POWA, first, to plan a safe separation.
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