Ex boyfriend spreading rumors. What do i do?

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You do two things:
You report him to your school
You press charges

Both for sexual harrassment. Start saving up evidence, if that is possible. Like facebook posts, texts, etc.

Teach this piece of trash a lesson. The worse that will happen is that he wont get in trouble. He will DEFINITELY stop though.

You know why? Because youre not some nerd that gets picked on. You are an innocent girl who is being harrassed and hurt by a big mean guy. Play the facts right and he will get fucked over. No one likes a guy who emotionally abuses a girl.

I almost wonder where are you from? Back when I was in high school, when things like that happened, the kid got the shit kicked out of him and learned to never fuck with girls just to hurt them.