He walked past me like I didn't exist, why?

Anonymous
We have some history but he's always been greeting me so kindly so I thought we were cool until out of the blue he just walked past me like I didn't exist. I looked at him but he avoids looking at me. It just came out of nowhere! Just like that. Why is that? After all we've been through he could at least be nice that doesn't hurt? He gave me the meanest look. Is his feelings completely gone just like that or is he angry or what?
He walked past me like I didn't exist, why?
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