He confessed to me and I said I see him as a friend and now he's ignoring me, why?

I'm 23 and he's 19 I knew he liked me and multiple times I tried to give him hints that I see him as a friend, he confessed to me and i said i see him as a friend then he was okay but suddenly after I posted one of my guy friends on Instagram story, he started ignoring me? what should I do, I like him as a friend and I was enjoying our friendship, should I ignore him until he texts?

He confessed to me and I said I see him as a friend and now he's ignoring me, why?
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