Broken

Airplane

My parents are going to get a divorce. Even if I like it or not. The reason behind it? My mother doesn't know how to love.
I was adopted in 2011 by my step-father, and there is one thing that he has told me that I will never forget. That is that the only reason why he hasn't left my mom is because he is afraid on what she will do. She isn't mentally stable, to put into short terms.
I don't exactly know what is going to happen, or when it will. All I do know is this. My family is going to be broken once again. This time- I have a choice on who I go with.
The funny part is, now that I know what mom is like, and i'm old enough to comprehend how manipulative she is, I don't think she will ever understand how I will never forgive her for what she has done. She is a gas-lighter. For those of you that have no clue what that is, it is the worst type of manipulation you can imagine. It's a technique used to get what you want and make the other person brainwashed to believe they are in the right. My own therapist told me I was being gaslighted by my mom. It took so many years, so many fights, being abandoned on the side of the street, being slapped with her wedding ring finger, screaming at one another, to even me getting lost in my own thoughts while she's talking to the point where everything goes silent to figure out that I was being manipulated. I know people have it worse than I do, don't get me wrong, but being told you're loved all your life, then realizing that they really aren't capable of love... It hurts.
I remember the night that I woke up around 1 in the morning to figure out my mom was screaming at
my dad. I remember going out there to figure out what was going on. Then I heard a sound i'll never forget. The sound of my mom hitting my dad. I screamed at the top of my lungs for her to get off of him. She did, but she didn't shut up for the rest of the night. It was "Fuck you" "You don't love me" and "just leave" all night long. My dad has been nothing but loving towards us. He took her out to Kevin Heart for a date night, and she got drunk and had a bipolar break. What did it take for her to go to sleep? Me coming into the hallway and saying, "Mom, if you really love me and [my brother] you will go to sleep and let us sleep". I stayed as calm as I could that night. Yet, she slept all the next day, and acted like nothing happened. To this day, it's been like nothing happened.
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Last weekend, I was in the car taking my moms friends daughter home, and she said, "Yeah, this pimp called he cops on me because I was punching, screaming, and kicking him."
I broke.
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Yesterday is the day where I realized I wanted her out of my life. I asked my dad, "why do you put up with this? you deserve the world!" to figure out why.
Want to know what he said?
"Because im afraid on what she will do to you."
He cares so much. Yet,  she's too blind to realize that she has the most caring family.
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I want out.

Help.