Why would a guy your not dating give a guy I’m talking to a deep eye stare?

It’s like he pierced through his soul for 5 seconds while standing 4/5 feet across.

what does that mean? He did that and walked away. The other guy looked for a sec.. but I don't know if he noticed or not.

also the guy doing the staring is talking to someone but they aren’t in a relationship

Why would a guy your not dating give a guy I’m talking to a deep eye stare?
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