How can I talk to him....?

Back in February some really, uh, complicated...stuff happened with the guy I like. I'm like 99% sure he used to like me but I doubt he still does. But now I heard that he doesn't like me at all. He thinks I'm annoying, which is weird since we never talk to each other, it's too awkward. My friend Libby, who was trying to play matchmaker(but totally failed) said "Why don't you like her? She's so much prettier than you!" and he was like "uhhhh...she's kind of a stalker....." and she said "yeah, she's obsessed with you, so what?" I'm not mad at her because I know she was just trying to help, but it's weird. I feel like if I tried to talk to him casually, he would just be like "ewww, it's her". I REALLY like him, and it's killing me that he dislikes me so much. What can I do to at least become friends, and maybe make him like me again? What can I talk to him about without seeming weird?