Q:

Somewhere in Time - Who is this character? 

In the time-travel romance movie "Somewhere in Time", a young playwright from 1972 uses an old pocket-watch to mystically travel back to 1912 and meet an actress he has fallen in love with from old photos.  The film has a paradox where:

 The actress he loves is the old woman who gives him the watch in 1972, at the beginning of the film, and which gives him the idea to time-travel. 

When he gets to 1912, the actress' manager is a middle-aged man (portrayed by Christopher Plummer) who is not only super-protective of her, but also told her that she would meet a young man and fall in love.  Throughout the film, the manager than tries to keep them apart, supposedly for the woman's "own good". 
I remember when watching this originally, I expected the manager to be an older version of the playwright character who was trying to change his OWN past.  However, that can't be since 

 the young playwright dies after returning to 1972. 

So, my question is WHO is the manager (really) and HOW did he know what was going to happen in the (relative to 1912) near future? 

A:

If I think normally without any complexity, Robinson had tricked Ellis  that he was known about her future so that he could get control over her.  Robinson had always known that she was a young women and one day a man of her dreams would come and marry her, In that way he had assumed that he would spoil her acting carrier.  He had told her that.  That's why she had asked: "Is it you?".  When she had asked Robinson if he was the one, he had answered: "Only you can say it for certain"

