Why are guys like thus?

I met this guy 3 months ago but we hardly talked and 3 weeks ago we started to actually have a conversation but I could only meet him once a week so we exchanged numbers he helped me with notes and we were texting contsistenly for almost 3 days. After that when we met in person he was very warm he wished me good luck for my exam told me how his week went and he was the one to approach me first. And suddenly over the weekend he left me on delivered. I’m pretty sure he likes me back but why is he behaving this way. Also he’s very shy in person. And we didn’t have any fights or disagreements or crossed any boundaries everything was fine his last text was literally a question.

Why are guys like thus?
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