<human>: I'm a web designer at a university, although on paper I actually work for our university library.  I do a ton of stuff campus wide, which varies from communicating to students on social media, to editing our press releases, to sometimes creating new sites for different departments or colleges.

Recently, our instructional technology department hired a new guy who they claim is now the "University Web Developer."  The problem is, he isn't.  For him to ever be the official web developer of the university, he'd have to be employed by the administrative offices, which he isn't.  The IT department really has no say so in any administrative decisions whatsoever.

The new guy has become somewhat of a dick lately, mostly because he's seemingly under the impression that he supervises me.  Which he doesn't.  The only person who is my direct supervisor is the dean of the library.  I keep getting a lot of "direction" from him from various emails and meetings, which is starting to tick me off.

I hate it that our work relationship is taking a downward turn, when I first met him we really hit it off and had a friendly talk for almost an hour.  But now that he's somehow gotten this idea that he's over me, he's turned into an asshole.  So how do I deal with this?  I don't want to tell him off, but he does need to know that I don't report to him.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: A new hire under a different department wrongly thinks I work for him.  I need to make it clear to him that I don't.