How do I deal with a friend who says one thing about a guy and does another?

I don’t understand her , I became quite close to her at work. And we always talk anyways this guy that I don’t trust and hardly speak to start approaching her a lot at work lately, she been even telling me stuff about him and one day we happened to work together and she kept telling me how she don’t want him to approach her and that I should be near her all the time and I even kinda left to get paper she was like why you leave me than yesterday he approached her again she was fine talking to him and even waved back to him to say bye and said he just a friend anyways how can I Trust my friend at this point and the fact that I don’t want to be in this mess with her I don’t understand why she say one thing and next day another

How do I deal with a friend who says one thing about a guy and does another?
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