He posted a photo someone took of us walking with no context?

I’ve been seeing this guy non exclusively, he and his close friends treat me like his girlfriend but we are not exclusive yet. Thing is he posted on his Instagram story today a photo someone took of us walking from behind, it wasn’t a pretty picture or anything and it was from like a month ago? He didn't tag me either. Any reason for this?
He posted a photo someone took of us walking with no context?
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