How do I move on?

I've liked this guy for almost 5 years. We never dated and never had a talking stage. But I can't get over him. I'm attached for no reason too, he's already hurt me once. Backstory is, I met him in 6th grade. Never caught feelings then, but once I was in 7th grade, I started catching feelings for him. So, two days before Valentines Day, I finally got the courage to confess to him. He rejected me. He added me into a group chat to make fun of me with his friends. (I'm aware, I just can't move on and I keep thinking about him) I got upset and I left the group chat. One of his friends got mad that I got mad. So I had to apologize. The next day, I got blocked on everything. A few months go by, I've created a new IG account. He follows me. We start following each other back. We like each other's posts back and forth until freshman year. I wanted to move on so I blocked him. Sophomore year comes by. We end up in the same three classes. He keeps staring at me. Intense eye contact (always looked angry but can't tell if that's just his regular face). Junior year comes by, again continuous staring. I ask a mutual guy friend about what *he* feels about me. The guy friend asked him and he apparently said "She's alright." After that, I see him smile when we make eye contact. He visited my class a few times and we had no classes together in junior year. Senior year, he looks nervous around me. All of this is pointless though. He won't make a move. He's also hurt me. The advice people are giving me, don't work. Do I need a therapist?

How do I move on?
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