How do I get over this guy?

A guy i had a little crush on in 7th grade just because he was a little bit nice to me. Now in 9th he’s with a girl i sometimes get jealous of. It started with seeing them in her car on their was to school, it physically hurt seeing them together, that was last week. Now, one week later they’re holding hands.
I didn't know i had these deep feelings for him since i haven't felt like this ever.
I dont even want a relationship and i wouldn't try to get with him even if i got the chance (cuz he's an fboy) so i dont know why im this hurt?
please help i can't stop thinking about them and its making me sick😭😭
How do I get over this guy?
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