i had a bf who did that once.My ex used to call me all the time. While that seems like an inane thing to be "peeved" about, it truly did get annoying when he'd call me at work just to say "hi". We'd say "hi" then 15 minutes later he'd call again. Just to say "hi". The crazy thing was it wasn't like he wasn't working as well. I guess he just had more free time on his hands at work to call me up. Just to say "hi". But he would blow up my phone at work constantly to the point where sometimes I wouldn't answer the phone at my desk when the caller ID would read his name.
i told him to cut it the fuck out.