How do you shake off someone clingy

I've always liked to live a private life at work, q where I socialize from work but my life away from that is private. However there's this guy from my current workplace ( I'm making roughly 7 months), we shared a few likes here and there, movies, music, cinema, COD, so progressively bro got into my personal space and twas cool, but problem is, I think he's overdoing the bro thing, he visits my office abit too much, blows my phone calling me to his, blows my phone whenever he can and mostly it's for(sorry to say) nothing of much substance. Did I mention he gets pissed necessarily if you ignore him small small, I'm basically on the edge here, fams at work already starting to look at us sideways (or at least me, coz he clearly doesn't notice the awkwardness of all of it)