Why did he call my guy friend my boyfriend?

So this guy at work said about my guy friend “ hows ur boyfriend (his name)” I was just hangin around cuz we had nothing to do and he's defo a friend and i was like “ are u mad he's my mate” and then he goes later on “ hows you bf” 🙄 uhh i dont mf have a boyfriend 🤣🤣🤣🤣🤣

Then he bumps into my intentionally and fuckin pushes me playfully jheeze

Why did he call my guy friend my boyfriend?
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