Free Rider

It will only take a moment to recall that afternoon. The details are unclear, but what happened can't easily be forgotten. A man; the same height and build as you, came into the room. I turned to step out of my chair, breaking view of the man for only a moment, and when I looked back in the direction in which he had appeared, he was gone. Thinking it was you, I stepped outside to go after him, assuming the man I thought was you hadn't seen me, and left the room. Well, that's when I ran into you, right outside the door. The only thing is, your shirt was different. 

Well, that night, as I slept, I had a dream. The dream recalled that very same afternoon, when I had assumed you walked into the room. Well, he was in my dream, smiling at me. He was wearing a different shirt than the one he had on earlier that day. This time his shirt was wearing a Hawaiian shirt. The following day, I saw the very same man, wearing a Hawaiian shirt. He was in a completely different part of town, and he looked over at me and smiled in the exact same way he had in my dream. Do you think this man is a ghost?