Why would a guy leave me comments?

Here is the deal I use 2 like a guy n middle and high school but its like he neva really like me and always said he had a girlfriend and I use 2 chase him but I don't even like him like I use 2 and I seen him on myspace and left a friend request jus because I rememberd him and now he leave me comments on myspace now that he sees I'm not paying attention to him anymore. Y is that?