Why did he stare at me like this?

I was walking towards my crush. He was walking towards me with his friend. He was quite a distance away and I saw him stare at me and then look away. As we got closer to each other, we were just staring at each other. His mouth was slightly open and he was staring at my face. I then said hi, and he replied with a quiet “hello” and instantly looked down to the ground.

For context, this morning I saw him glancing at me a few times from a distance. He also looked away very quickly when I caught him once. As he approached me, he also stared, said good morning and teased me about leaving the door open.

Why did he stare at me like this?
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