Should I check up on him if he left me on delivered?

I have been dating this guy (not official, but we have been talking for months and have been on a few dates). He usually will text me back within a few hours, even if he is busy. But last night he stopped responding to me around 7 pm which is not like him. He usually stays up talking until at least 10 pm. Even if he doesn't text back at night he will text me first thing in the morning, which he didn't this morning. It has been 18 hours now and his snap score has not gone up. Should I send him a message to see if he is ok or should I just let him be?

Should I check up on him if he left me on delivered?
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