Why does this guy who I guess can call my friend likes to often times randomly butt in into my conversations I find it annoying?

I was talking with a girl coworker out of nowhere he gets his butt into our conversation, I was like you being noisy and he kinda got offended when I said that but he will do it often especially when it involves me who ever I am talking with specifically with girl coworkers why is that?

Why does this guy who I guess can call my friend likes to often times randomly butt in into my conversations I find it annoying?
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