I think a kid who bullied me tried flirting with me.
That's rather odd. Why do you think he was flirting?
His words were so, I don't know how to describe, creepy?
That must be jarring.  It is not cool to bully someone.  But for him to bully you and then flirt is also inappropriate.
It's disgusting. I'm scared.
If this person is making you uncomfortable and bullying you, there's nothing wrong with reporting them. If you're a student, school staff will help, or you can contact the police or some other authority figure such as your parents. You don't need to deal with being harassed like this.