Is this suspicious behavior?

This just started happening with my boyfriend. Every night we lay down and cuddle, close our eyes… whatever. We both are on our phones at night but then my boyfriend tells me to turn my phone off and let’s go to sleep. We both turn our phones off (just lock it is what I mean) then cuddle. A minute or two later I open my eyes to look up at him and see him on his phone. I look at it and it’s always on a text message but he quickly locks the screen before I can read it. He gets off his phone like he’s going to go to sleep with me but then again I catch him on his phone and hurries up and lock the screen.

Is this suspicious behavior?
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