Why did he brush me off?

Lashawnsx3
There's this guy who I had history class with for a semester that had an obvious crush on me for over a year now. When we had the class together he would always stare and smile at me when I walked in, he would talk and laugh about me to his friends, he'd get jealous when I talked to my guy friend, etc. He only talked to me once though and it was brief about an assignment we had and that's it. He acted normal when he was talking to me, though he didn't make eye contact with me. After that class I didn't see him for a semester. Fast forward to recently, when we saw each other around school he would always stare and smile at me or stare at me with a somewhat sad look. When I didn't smile back at him (because I was nervous or caught off guard) I'd literally watch him sigh with sadness. I said hi to him when I walked past him and he said it back after I said it twice but didn't give eye contact. Anyways fast forward to yesterday I finally worked up the courage to talk to him after I saw he purposely sat near me in the cafeteria. And before I approached him he did smile at me but like I said earlier he caught me off guard and I freaked so I just looked down and I saw him give a sad sigh. So when I went up to him and asked about the class we had together he played dumb at first and then he kind of sassed me and seem like he didn't want to be bothered so I just left him alone. I haven't seen him since then and I kind of think he's avoiding me but then again, the world doesn't revolve around me so I don't know.

I will admit on my part I didn't flirt as much as I should have because I was shy and was afraid he didn't really like me but was planning on using me. But when I talked to him I thought that would make him feel more comfortable to approach me and not just continuously stare at me for over a year.

Why is he acting like this? I'm 21 and he's 24/25 and I just feel like we're too old for this nonsense, especially for it to go on for this long
Why did he brush me off?
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