Why is he avoiding eye contact all of a sudden?

A guy I’ve been close with suddenly avoids looking me in the eyes, and it’s throwing me off. Why would he start avoiding eye contact out of nowhere? Is it a sign he’s upset, uninterested, or something else? How can I figure out what’s going on?

Honey, people who can’t look you in the eye are hiding something. My ex practically invented that move when he was cheating. The only way to know for sure is to ask him what’s going on, straight up.