My teacher threatened to slap me! What do i do?

If this was a teacher who did this to you. You can probably try to get ahold of the school's superintendent and tell them what you just wrote. Admit that you made those mistakes, but that he as an adult did not make the right actions, and that you do not want this to happen to other students. He should at least get a warning. If something is not done ... it is possible he will actually do something the next time around.