I need help. Please help me?!

-I catch him staring at me
-He's really mean to me when his friends are around but nice when they aren't.
-He says I have a penis
-He punched me but only because I whacked him with a pencil (IDK WHY)
-He threw a crayon at me and I thought it went into my bra and hes like "It didn't go down your shirt, you just want to show me your bra"
-When ever I say something that sounds wrong, he says "That's what she said" and laughs.
-He jokes with me a lot and usually they are insulting sex jokes
-At recess when I told him that I fail self control and later on in the day I think he brought it up to make fun of me and then he was like "I fail self control at night" (O.O)
-He says I'm the "she" in the that's what she said joke.
-He raises his eyebrows at me after he makes a sex joke
-He's liked me before in the lower grades
-He asked me to slow dance once

*He's really nice when no boys are around, listening, and/or looking.
*We are in the same grade and the same age but a few months apart
*We're in middle school