Guys, Is he really interested in me?

I’m a single mom. I’ve been seeing a single dad.
we talk a lot and seen each other a few times already. I really like him and caught my attention compared to the other guys i was talking to.

He works long 12 hours of overnight shift. He makes time to talk to me during his break and in the morning when he gets home before he pass out.

the issue is when I can’t talk to him for days when his kids are with him for a week. I would message him asking if he’s okay. He does eventually text back saying his sorry and doesn’t want me to be upset. He’s been ignoring his phone, “not just me”.
i understand giving undivided attention to your kids. But it doesn’t stop me from worrying if he’s really not that into me.
I haven’t dated anyone since I broke up with my kids dad so I really don’t have a clue what to expect and what I’m doing. All I know is I feel sad when I can’t reach him for days.

Guys: is this a “normal” thing? Or should I be concerned?
Guys, Is he really interested in me?
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