He didn’t read my message but active on Instagram?

My boyfriend said his work really took his energy lately. We usually text by imess on daily basis, but recently he just reply me mid night after his work when actually his work starts at evening. He didn’t reply or even read me on imess even he viewed my story on Instagram. I am not sure is he avoiding my text or he just haven’t check it because he has 2 phones, one iphone and 1 android. With this behaviour, is he avoiding me or am I just overthinking and being sensitive?
He didn’t read my message but active on Instagram?
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