Okay, so my boyfriend got a note that dicho nasty things on it and dicho that i wrote it. I told him I didnt write it, and he doesnt believe me. What should I do?

If he doesn't trust that tu wouldn't say those things about him, that means he didn't trust from the beginning. Ditch him!

Say "If u dont have enough trust in me too believe that i didnt write that note. Then this relationship isnt going too work."
I know its hard to say something like that
But a good relationship is built on trust

Find out who wrote it, and improvise from there.

Either appeal to their better nature and get them to tell your boyfriend the truth, o just find another way to prove to him it wasn't you.

Break up with that bastard~

give him what he wants if tu know what i mean