What do you do when your boyfriend yells at you so loud and yells over you trying to say something and he won't let you?

One time my boyfriend yelled so loud and I couldn't get a word in edgewise.
So, I yelled at him one time during that screaming match and this is what I said.
"When you won't let me talk, you are taking away my First Amendment Rights and you can't do that. I have a right to speak.
And you know what? He shut up and let me talk!
What do you do when your boyfriend yells at you so loud and yells over you trying to say something and he won't let you?
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