How do I know if I've been left on read or if the guy hasn't seen my text?

I've been friends with a guy for almost 3 years now and recently got his number since we're in advanced classes together and are "study buddies." I've had a crush on the guy for 2 years and he KNOWS it. I've told him I've liked him but he hasn't made any moves to advance our relationship until more recently. A few days ago at a church camp, he helped me down a dark stairwell and held my hand even after I reached the bottom, and he even hung around me everytime he had the chance to. We've been texting a good bit since the camp ended (we're out because it snowed and shut basically the entire area down) but now last night I answered his question of why it was still snowing and got no response. I even texted him "Good morning" with a picture of my backyard and got NO response. I can't tell with my phone type if he's read it or not, so how do I know if he has left me on read the entire day or if he just hasn't seen it?

Sorry for the long explanation.😅

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So... yeah he did leave me on read. And didn't care about it either.😅
How do I know if I've been left on read or if the guy hasn't seen my text?
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