Why can't he leave me alone?

There is this guy i use to go to high school I'll call him (Will). Over the years in high school we didn't like each other. Until 11th grade. He ask if i had a boyfriend and we flirted a little bit. I told him i how i felt about him too. He told me that It met a lot to him. Than about near the end of 11th grade he started being mean to me again and saying ugly things to me. so i was over it, and moved on. 12th grade came he had a girlfriend loves her to death. i started dating ,but Will didn't know. So he still thinks i like him. Then Will told his girlfriend that i was staring and that i liked him and trying to break them up. Which is not true at all! because i had a Hugh crush on this guy Matt who i worked with at the time. Ok we graduated. he goes to the same community college that i do. He just cant seem to leave me alone. I was walking with my friend Tay and he called me a b%#@. When i was picking up me friend from school. He was picking up Kay(gf). He saw me and gave me the figure and called me a b. I wondering to myself why does he not just leave he alone? I know he hates me , but why can he not just ingore me like i do him? Just last week i was walking me my car and him and his girlfriend say that i was dumb. i just like a them and laughed. i just need some type off answer. I don't understand why he won't just leave me alone and why dose he still think i like him? Even though i am well on my way of dating someone right now.