How to talk to your supervisor?

Every month, my Team is in rotating shift. First, my boss put me in a night shift however I rejected it because Tony is same shift as me. I make excuses to my boss, saying I cannot work at night shift due to health reason so she put me in afternoon shift but the real reason is Tony. The following month again, my boss put me in an afternoon shift, I was Okay but then Tony is same shift with me again. By company rule, I can swap with my colleague.

Tony is my toxic officemate who loves sabotaging my name to my boss. He loves reporting shits even if untrue. I hate working with him. My performance got destroyed because of him.

I want to have a peace of mind at work. So I am planning to change shift with someone at nightshift but I am afraid my boss will find out I am just making excuses or a lie last month that I can't work at night. What should I do?

How to talk to your supervisor?
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