I regretted opening up to some people

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I don't really have best friends up to about two years ago. I met my best friend coincidentally at a party with other people in college. We talked and shared a lot of things. I find myself being completely comfortable around her, I can laugh yell or tell her any stupid thing without the thought of her judging me.
Everything is fine until recently we have a chance to work together. I step by step seeing her true color. She always sounds like an innocent girl and a naive one who asks for advice all the time. I didn't think she could be this way. She treated me like someone she would look down and making fun about, she bitching about other girls, she show up as a jealous girl who thinks all the girls except her is not pretty enough and/or can't do anything but put on some makeup. She bring me food and give it to me like I'm begging her for that. I felt offended. I can feed myself up if that's what she thought when she brought me some food to work. I just don't have time to get it myself at that moment. I started questioning myself that is she ever considered my as a friend or is she looking down on me the whole time?
She asked me to do my job even carry her part just for her to have some spare time playing with her phone. I know she introduced me to this job but I feel like I can't be there any more.
I'm feeling sad cause I lost a job and also lost my best friend.

What should I do? Please help.