What should I do next? Am I overreacting or is it him at fault?

So my boyfriend upset with me because I didn't want to video chat. that night I told him I wasn't in a good mood, so he became dry and ended the convo. he hasn't spoken to me in a couple of days. I don't want to message him first because he's the one upset about it. We've never met (got together through a social media platform). He says he's very serious about me and told his family about me. He's a bit older and I'm about to turn 18. What should I do? He's posting on social media as well, so it's not like he just hasn't been on. I don't know why he got upset about me not video chatting. I get we were both excited, but I was in a really down mood. Please give me your advice and opinions.
What should I do next? Am I overreacting or is it him at fault?
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