What should i do about this guy that i have liked for 4 year? I need your opinion please? 10PTS BEST ANSWER?

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So this guy liked me for 2 years I was grade 8 he was grade 11 he always used to stare at me and he used to follow me in the playground also he once followed me to the bathroom to know my name my friend always told me to not get my hopes up but I did anyways he never did talk to me though I added him on fb but he didn't confirm but then again he hasn't opened fb in two years thing is I liked him since I was 13 but now I'm 17 and he's 21 but idk where he is its like he's gone out of sight but my brother told me he saw him a couple of days ago I liked seeing his sisters fb and it showed pictures that they were in America see the thing is I decided its time to move on after four years of liking him but once my teacher told me to go to the supervisor and get exam papers she told me take these they were in a cabinet so I took them and while walking to class I realized his name was on the last paper so at first thought I was hallucinating but then I showed my bff so I don't think of myself as a freak anyways he graduated four or five years ago so why would his name be on the paper after I decided to forget him ugh is fate mocking me or something