Boyfriend said he took a nap then he stops txtn n I call and his phone was off?

Today is my boyfriend day off I saw him in the morning like usual and we spent time had sex then he said he has to go drop something of at his mom work which he was text this happen at 12ish and at 1he was home we were txtn and around 3 he was lagging it then he said he took a nap I replied fast as I saw he didn't reply in 10 min I call and his phone is off wtf? Now is 4 pm.
Boyfriend said he took a nap then he stops txtn n I call and his phone was off?
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