My manager promoted his friend over me and gave an excuse, What do I do now until I find another job?

My manager promoted his long time friend over me for a manager's position. He hired her and got me to train her in our department. He drives her to work most of the time and they hang out outside of work.

Since she started working there she barely did any work. She complain when she broke a nail, when she had to do any kind of work she goes to lunch and sits in the break room eating most of her shift. She even bragged to another coworker about how she barely does anything. Nothing she did bothered me until our manager brought me into it. Several coworkers and other manager have complained about her behavior to him and every time he brings up my name and lies on me. If someone said she does nothing, he would say I did nothing. If someone told him she sat in the break room for periods of time, he would deny it and lie and say i would sit in the break room periods of time. The situation has nothing to do with me. He has promoted her and says she was the only person in the department working and actually doing anything. Regardless of him saying that, he still gets me to try and help her and also help himself.

My manager promoted his friend over me and gave an excuse, What do I do now until I find another job?
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