I don't think you're stalking him at all because you haven't contacted him or bothered him in any way! Looking at his profile his perfectly normal because you still have feelings for him, it must be tough, I understand. Try to stay busy doing a lot of productive things to get your mind off of him so you can move on with your life. Maybe in the future you'll find someone who will treat you with the love and respect you deserve, it seems like this other guy never did and you most certainly deserve to be happy too.

I hope you get over him soon and that you meet someone very special as well.