How should I get over my breakup with my best guy friend?

My guy friend and I were in a relationship (he’s 17 and I’m 16). It wasn’t a serious relationship at all. We were both each other’s very first crush though. We figured out last night that it’s best if we just go back to being friends because we just kept arguing over little things. He felt like his world was crumbling in front of his eyes. We’re both just stressed out since school is starting next week. (We go to different schools).
He’s already completely over it, I’m not though. How can I process my emotions without seeming like I’m upset with him?

How should I get over my breakup with my best guy friend?
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