What does it mean when a man stares and watches you all the time?

Anonymous
I have know this man for over three years, for over two years we would talk to each other all the time, mainly by text and email, in the last year it has stopped. This is where it gets confusing, we work together and whenever we are in the same place he will watch me the whole time, he constantly stares at me, deep intense stares sometimes smiling, other times not, he doesn't look away and it is mainly eye contact, he will sometimes check out my body, but mainly he stares at my face. There was a group of us from work that went out for drinks, and we spent the night staring at each other, then half way through the night we were talking together and we ended up just staring in each others eyes for about five minutes, without saying anything, and smiling, he reached out and stroked my face, and then walked away. It was the first time he has ever been affectionate to me. He knows I have feelings for him. Now he won't talk to me at all, but the staring and the watching and the intense eye contact are still there. He also gets extremely jealous if I talk to another guy. Why?
What does it mean when a man stares and watches you all the time?
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