I'm usually a quiet girl who's polite to everyone at work. But truth be told, I'm tired of it. I wear a mask and secretly don't like my boss.
That's not uncommon. Why don't you like your boss?
I don't like how he behaves towards his wife when she works with him.
It's reasonable that you'd dislike your boss because he doesn't treat his wife well. People should treat one another with respect.
I'm thinking of telling my boss off and let him know he's a jerk. What do you think that I should do?
That might be going too far. Telling off your boss might get you fired. If you really feel like you must mention it, then be polite when bringing it up.