Did this person block me?

Basically I was texting this person (who also has an iPhone) and all the texts were sending as blue, then randomly one wouldn’t send, and sent as a green text message, I don’t know if it delivered though. I haven’t heard from him in like 2 hours. The same thing happened a few weeks ago where it wouldn’t send. Is there any way I can fix this?
Did this person block me?
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