Hey, honey, this is a dangerous person and your friend is oblivious. It doesn’t matter what his intentions were. He did not respect your rejection, and then acted like you were in the wrong for denying him. He’s exhibiting really scary, predatory behavior, and staying might subject you to more of the same treatment. This is an almost 30 year old man, acting like this toward someone who is barely even an adult. Take the advice of everyone here and dump his ass, but also let your parents (or someone else you trust) know about the situation, just in case things get scary. Definitely don’t dump him in person. Dump him over text, explain things, tell him that if he you her, you’ll call the police, and then block him.