Why doesn’t he look me in the eyes anymore?

My ex guy best friend and I had a big fight over two years ago and stopped being friends. We have the same friends so we see each other often and sometimes talk. However, he doesn’t look at me while talking anymore. If we do make eye contact he looks away yet he’ll keep eye contact with anyone even people he doesn’t like, basically everyone except me. I feel disrespected that he doesn’t since it’s been over two years. He’s a confident egotistic person who’s not afraid of anything so why can he not look me in the eyes?
Why doesn’t he look me in the eyes anymore?
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