I feel like I’ve ruined it with a guy I really like help?

So I’ve been seeing this guy for two weeks and we’ve arranged a second date! He seemed really into me messaging eachother everyday and sent pictures of his graduation and even his family. I accidentally FaceTimed him yesterday morning, and I brushed it of as an accident but I think it freaked him out. His tone totally changed and now he says he doesn’t want anything too serious / texting every day! I really want to message him saying that it was an accident but should I wait a day or two as he’s genuinely really busy but I don’t want him to come to the conclusion I was seriously calling him :/
I feel like I’ve ruined it with a guy I really like help?
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