Take detailed notes of any more dreams that involve him as soon as you wake up. This will help you to see what it is that his figure is doing there by looking at how he acts, what he has done, and what sensations it gave you.
Beyond that, it is difficult to say.
Most men of intelegance have some sort of quirk about them. In this case, that is to say that your brain didn't just automatically give this character a shape from your past, it might be him reaching out. His quirk being the active practice of magic, which in main stream society is seen as odd. This is unlikely though since you really don't know each other.
Otherwise it might be something with a form unknown to you trying to make a connection. It could be ANYTHING that you have never seen before, an angle or deamon or maby even god, including another person. From what you have described, the flower might be an apology for causing you pain in a previous encounter. This is slightly more likely, however it is pretty far fetched.
Any who, it is best if you draw the final conclusion because you are the one with the dreams. I do advise the journal though, just keep it away from company, they might think it odd. ;)
Best of luck!