How can I get my former fuck buddy to leave me alone?

I was screwing around with this guy for a couple of months. One month, I had a pregnancy scare and it made me re-evaluate the situation. He is definitely not someone that I would want to be genetically bound to or someone I would want a child with. I ended things as nicely as possible, “telling him that the situation had run its course”. He says fine and insists on being friends. Honestly, I do not want to be friends with him, being that he just reminds me of a period in my life that I’m not very proud of. However, he won’t let it go. I’d been ignoring his texts and calls. Eventually, I blocked him and he started calling from different phone numbers. Yesterday morning, I saw that someone slit my tires. I can’t really prove it’s him, but it’s interesting that this happened.
How can I get my former fuck buddy to leave me alone?
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