How do I save myself if a man at work acts like he’s my friend most of the time but he started negging me and it ruined my self worth?

What do i do if a male coworker was nice and seemed interested but then he started putting me down based on my physical appearance over and over and I don't know why; now I feel like a walking mistake specially when he’s at work?

How do I save myself because he won’t leave me alone. He acts like he’s nice to me most of the time but slips in those insults at random times. He keeps saying im his favorite coworker.

How do I save myself if a man at work acts like he’s my friend most of the time but he started negging me and it ruined my self worth?
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