Boyfriend takes work calls in the shower

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My boyfriend is one of the managers at his company, and he’s always getting work calls off the clock from the employees and his co-manager. He picks them up but I swear it’s always at the most convenient time and I don’t know if that’s supposed to be normal or not. He even picks them up in the shower. And I know it’s work related because I can hear what he’s talking about and I’m not worried about it being like a sneaky link or something. I just don’t know if this is normal or if he should work on his boundaries for work. He says it’s his job and that it’s really important but is it more important than spending time with me???