Hey there. Thanks for reaching out here on TeenHelp. I hope we are able to help you.
The first thing I want to say is that
you are not in the wrong. Your ex's behavior is actually abusive, to a scary degree, and I am so sorry you had to endure that. I can only imagine it's even worse that your parents and friends believed his lies. The fact that he swayed your entire support system is devastating. I am glad things are better now, but I am so sorry that it happened at all.
If your ex won't leave you alone, you may need to involve law enforcement. What he did was already illegal if you engaged in sexual relations, as he is an adult and you are still a minor. He could be arrested for statutory rape. Even if you didn't have a sexual relationship you could still get a restraining order against him. He should not be near you, period, and if the law can help you ensure that, then utilize that resource.
I know you don't want to "rock the boat" but you are a valuable person, and you deserve support. You shouldn't have to bear this abuse on your own. Reach out to people you trust, even if it's just one or two people. Honestly, holding this all in will possibly eventually lead you to engaging in harmful or risky behaviors to cope with the complex emotions. I also suggest, especially if you don't feel like reaching out yet, to express yourself. Write poetry or stories. Paint, draw, sculpt- do art! If you like physical things, it's a great way to expend energy- running, sports, rock climbing, even just working out at a gym- it's all good!
I hope this helps. Remember, you are valid and your feelings matter. You deserve to love yourself, and you don't deserve this pain.
PM me if you need anything.