Why are quiet guys SO confusing?

So, I reached out (yes) and texted the super introverted guy that I liked at my school (I have no classes with him but we used to last year) and well, he matched the energy! He helped me out with some classwork, he asked questions about my life, and he told me personal stuff about his life too even though we've barely talked around school before this (like twice). The whole texting ratio was great too, he replied with lots of messages and I genuinely felt a friendship forming. This is really unexpected for him too because he basically has like... no friends. The only thing is, I had to initiate the ENTIRE time. And it got to a point where he was just super dry one day after taking a whole day to reply and since he didn't keep the conversation going, I just left his message on read. But he still smiled and waved at me when we saw eachother in the hallways. It's been 2 months since we last stopped talking and we still wave at eachother but he hasn't initiated ANYTHING. He doesn't even like my stories when I post. How am I meant to interpret this...

Why are quiet guys SO confusing?
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