Fed up with my boss!

I have been at this job for over a year,in that year i managed to stay out of any drama,well when my brother started working there,my now boss started sleeping with him,which is AGAINST the rules,so this goes on and i have to keep quiet,finally my brother leaves but they still see each other.......fast forward to today and she is just taking everything out on me,i don't know anything about her duties but she makes me do them and when i mess up she will post online all the mistakes i did that are public for everyone there to read. Just 2 months ago she was begging that i lie for her,that she never slept with my brother.But you know what? I'm tired of being nice,I'm tired of her treating me like shit.She has been trying to get me to move up just so i can call it even,but i don't want it unless i deserve it.and i don't(just yet lol)there's a guy there that does.I don't want to "snitch"but i also don't want to "threatened" her,i just want her to realize that she is pissing me off and if her attitude doesn't change I'm going to be gone and all her dirty laundry will come out!