Why would a guy accuse you of talking to other guys?

Something has been off with my boyfriend. Every argument we have gotten into he has accused me of talking to other guys. It so random because it has nothing to do with what we are arguing about. I do tell him other coworkers flirt with me and the things they say to me but i tell him i dont flirt back. I offer to show him my text messages and my call logs and he refuses to look at it. I ask me to show me his and he squints his eyes at me and always says no. I ask him if i could at least take a peak at his messages and its a no. A new thing has popped where he fears im sending pictures to other guys and making fun of him.

Why would a guy accuse you of talking to other guys?
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