Family relationship Advice needed

So, I haven't used this before but I need some advice,... in short, my ex married my brother's ex, and is my mom's best friend. She was like my sister growing up and now she won't have anything to do with me since she's with my ex. But my mom talks about her all the time. she is in everyone's life but mine. Furthermore, my brother, whom she was married to, really duped me in a shared business, and my mother thinks he is wonderful. I visit my mom but it hurts a lot cuz no one recognizes whats happened in light of trying to share my feelings. I hate to cut off my mom but I am not sure what else to do. I have done lots of counselling and have been brought to the place where I need to protect myself.
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