How do you stop worrieng about someone?

IM WORRIED ABOUT SOMENOE I LOVE NOT LIKE THAT ITS AN OLDER GUY ACTUALLY A TEACHER HE HAS BEEN ACTING SERIOSLY WEIRD LIKE I SAW HIM ON THE PHONE AND HE LOOKED HURT I WOULD HATE TO SEE THIS PERSON HURT AND I AM CONCERNED BECAUSE I SAID SOME STUFF THAT WAS SOOO NOT TRU AND I HOPE IT WASNT ME THAT HURT HIM EMOTIONALLY!!!