If he likes me why is he all of a sudden avoiding me?

he used to go out of his way to be near me and he’d stare at me and sometimes even shyly smile and today he was literally doing the most to not be near me like he was standing in the corridor then hid in a way that he’d be able to see me but I couldn’t see him then later on in the day he just kept staying out of my way and had his back to me the majority of the time. What’s his problem did he lose interest or?
If he likes me why is he all of a sudden avoiding me?
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