Should it be a red flag if he says he fell asleep, but didn't really?

Anonymous
I was texting this guy last night and I told him I needed to put my ohone down to go help my family really quick. He said he'd be there. I csme back, messaged him, and he ignored my text. I saw him posting on facebook. He messaged me today in the afternoon, and said he was sorry cause he "fell asleep." He did respond to what I spoke about on the previous text but still, he lied.

Am I being dramatic?
Should it be a red flag if he says he fell asleep, but didn't really?
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