Why would my ex cover his face whilst he was working out behind me and I was performing a bent over exercise in front of him?

He was covering his face and looking away we didn’t speak a word to one a another, he smiled at me breifely when I was coming out of my rep and looked up but I didn’t smile back

Why would my ex cover his face whilst he was working out behind me and I was performing a bent over exercise in front of him?
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