Why would a man only call or text on weekdays?

He has a workload that is busy. But I see he has read my messages when he texts and he mainly texts on weekdays. Except when he is off for a holiday, I do not hear from him on the weekends. Well, only at midnight on Sundays.

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We are not a couple. But he acts like he's my "boyfriend" with all the messages and calls he makes. We are just "friends", and I admit I like him but he's never made a move. We are far from one another.
Why would a man only call or text on weekdays?
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