Why does he watch me when I walk away?

So I've been seeing this guy for eight months. We aren't dating we are now friends because he friendzoned me after I asked what we were - he said he was 'thinking of kissing me' and since then he has never made a move and we only hug

the other day I saw him at uni and he sat next to me in a lecture. He kept talking to me through the lecture and then when I went off to the toilet he was staring
at me walking away. Then at the end,
i had to leave straight away and I told him and left and I saw him staring at me as I was getting my coat and bag together to leave

why did he keep staring at me when I walk away?
Why does he watch me when I walk away?
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