Why I will never get married!! Today's the day I stop looking!

I feel like never ever getting married. After seeing the way relationships have falling part all around me and how people fight, I just don't think it's for me.I've seen my sister date all kinds of guys that beat her and she was married once and I watched him beat her, even stepped in between them before and then now she's married to a guy thats very verbally abusive. I made my strawberry trifle I posted a while back for dessert last night and my sister and I had some for dessert with our lunch today. He asked if we had eaten any today and I replied "yes" and then he proceded to yell at my sister saying (excuse my language) " M you need to stop fucking eating before you turn into a five hundred pound bitch". That's the least of the things I've heard him say. My mom only stayed her full eleven days because of the kids, she would have already gone back home because of the things he was saying to my sister in front of her. It's so disrespectful. I don't know how long I can deal with it without doing something myself. I honestly never want to get married and especially not if it's going to end in divorce which I believe this marriage will. I don't want to have to put my children through what I see my niece and nephew go through with their father. My brother also has been divorced and it hurt him a lot. He loved her and even got out of the air force and went into reserves just to make his marriage work for his daughter and the girl came home and ended up cheating on him. Now he barely sees his daughter because she tries her best not to let him see her. It really sucks, but I don't want the same bad luck that they have both had. I don't want to make those mistakes. UGH!!!! Today's been a hard day!