My friend is toxic, what do I do?

hey. so I have this one girl friend and she's my classmate. let's call her tina. our class is extremely toxic and I have barely someone to talk to, so I'm grateful for her. the problem is, I wouldn't like her much, if she wasn't my only option. I have another friend, but I'm not her bestie. well, tina is a bit toxic too and it has escalated even more lately. when I need some materials for school, she doesn't respond, even tho I would always respond quickly to her and give her anything needed. she just leaves me on seen, or delivered. in person she's making excuses and shit. I'm not mean to her, I always say I respect that, because she's good at manipulating. so she basically always manipulates me and I realize too late. she also talks with some girls, that don't like me in the class and I don't know whether she's talking bad about me behind my back. I can't believe her anymore, even tho she's sometimes fine and fun to be with. and also, sometimes she's not talking to me and doesn't tell the reason. so my question is, what should I do with her? I have zero chance of finding new friends in the class, because they're even worse than her and the only real friend here has already someone to be with and I'm just her second option. (sorry for the long essay)

My friend is toxic, what do I do?
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