How do I understand without opening up?

I have had a crush on a guy who is older than me for 6 months now. He is one of the kindest guys alive. He always help people, so polite, so thoughtful, a good listener, a good friend and recently I realized he is protective over me too. Not in a bad way, on the contrary in a caring way. I was thinking maybe he is also into me. But nowadays I got the chance to meet most of his friends and seeing how he treats everyone, how everyone loves him, I started to think he might not see me in the same way. I suddenly got the thought of he sees me as a younger good friend. And I got kind of disappointed but I'm not sure. How can I understand if he thinks I'm just a younger good friend for him or maybe a little bit more special than this? I don't want to open up yet, I don't want to ruin our friendship if it's one sided. Can you give me advices?
How do I understand without opening up?
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