Mass email

I have the most incredible boyfriend in the world, but my mom has always been extremely bipolar and since I started college and moved out she has gotten worse. She did some nice stuff like got me braces, cool christmas gifts, and would buy me expensive food (such as $3.00 single yogurts for lunch), so I feel like she was nice at times. Then again, she didn’t let me see friends, threatened that CPS would take me away if I didn’t spend days on end cleaning her house while she watched tv, laughed at my pain, threw stuff at me/yelled at me till I cried a few times per week, and would humiliate me in public and sometimes hit me.
She has gotten much worse since leaving for college and constantly threatens and guilt trips me. She tells me she’ll kill herself, that I’ll regret it when she dies, that my boyfriend will end up abusive, that I’ll lose all my financial aid and have to drop out of college, etc. and she does the above. She even keeps a death note by her bed!
Today she forwarded me a mass email about giving away my dog. Her house isn’t on the market and we both know noone will buy it for a few years and she knows I would take my dog if I had a home!
She then sent me a message on MSN and told me, “too bad I have to get rid all of the pets. I’m sure you got my email. Good night!”
Even when I am an hour away, she finds a way to make me cry and recently she has gotten so threatening and mean that I have started taking it out on my boyfriend. He had to cancel seeing me today because of a school meeting, and I got furious at him (which isn’t like me) and even last week he went to the arcade for an hour longer than he said and I refused to speak with him for an hour (and I love the arcade as well!)
My boyfriend is so nice to me, but I keep hurting him lately.
I don’t know what to do. How can I stop taking out my frustration from my mom onto my boyfriend?! I know she is trying to tear us apart because she is jealous of him!
Please help….she will NEVER admit that she is in the wrong and will get meaner if I confront her.
“all of the pets” meaning my cats too — one was a stray who was hit by a car that I saved and it took her years to trust people!