Why do guys act like nothing happened after a fight?

Recently, I got into a fight with my guy friend. I think he got mad over me because he thought I was dating someone even though I wasn't. So he ignored me for a few days and I did the same. But then yesterday he suddenly texted me talking about music and acted like everything was fine and there was no tension in the air. I was so speechless so I didn't text him back instead I kept him on seen zone. Is my act correct? And why he's not mad anymore? Why did he even get mad?
Why do guys act like nothing happened after a fight?
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