I dont know what to do anymore..

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My gf asked me to bring my car to her school then leave it there then me go to work. I tried to reject her proposal since my leg is hurting as of the moment. I know I'm wrong at that part since I didn't even try to do my best. But when I finally agreed to do what she wants, she suddenly doesn't want to anymore, and that was only for about less than minutes of conversation. She then brought up everything I did wrong for the past years and got angry at me. Whenever I tried saying that OK, ill do what you want , "I wont go". she tells me that I'm being prideful (don't know if that's right). I only did what she wants when she's angry then she's getting angry at me for doing that. She then threatens me that she would go out with other guys (tomorrow or within the week or next week) and that I may regret that I didn't took care of her for the rest of my life. I'm only asking her to not make her emotions be the best of her when she's angry. I agreed to her didn't I, that's what she wanted and in return she should have just agreed so didn't have to get into an argument. I don't know what to do anymore. I'm really thinking of so much things right now. I know I'm quite effortless at some point but I really try to be not that. I love her so much.