Why does he give me a deep stare during conversations?

Anonymous
I've heard that some sort of eye contact is a good indicator someone likes you but I'm not sure about eye contact during a conversation. I'm good friends with this one guy, we don't usually text each other and we hang out in our group of friends, sometimes 1-1. but when we are in groups and I'm talking to someone, i catch him looking at me. and when i talk to him, he looks at me with this deep stare that lasts for the entire time i talk. it gets awk so i look away. why does he do this?
Why does he give me a deep stare during conversations?
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