Why would a friendly person not want to make eye contact?

Anonymous
Im a cashier at this store and this frequent customer always comes in and he's pretty chatty about his weekend and wants to get to know mine.

Even if I'm not at the cash register till he will still approach me to say hi and ask how im doing and get personal without proper eye contact but he's listening attentively.

He has appraoched me outside of the store too to say hi. But his eye contact is weak, is he interred or being friendly?
Why would a friendly person not want to make eye contact?
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