Well, I'd hate to sound alarmist. I tend to take premonitions and feelings serious, too--or at least, not flagrantly disregard them.
The first thing that came to mind was a dream I had about my mother. Or, at least, it looked like my mother. Had me by the throat, and was holding me a couple feet--not a foot, a couple feet--in the air. Expression cold and serpentine.
So, the specific meaning and purpose behind your dream, I cannot say. It could mean some conflicted feelings you have about the person. It could mean some underlying grudge, anger, jealousy, perception of that person as a threat, or any number of other feelings and confusions.
I myself perceived my dream as demonic influence to harbor distrust between myself and my mother. Not all dreams, I don't think, are the actions of the divine or the infernal, but I do, as a Christian, think that it's possible for influence to occur there.
Though, for
you, the closest I can come to anything reasonable would be among the former (grudge, anger, jealousy, etc), and any of those would first require knowledge of your relationship with him.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)