If a guy only sees you once a week does it mean he's not serious about you?

The guy im dating works late during the week and I have to get up early. In the beginning we saw each other maybe once during the week but lately it's onky one day during the weekend. he works 3 jobs and his days off seem to be with me but should I be worried he's not seeing potential if he onmy sees me once a week on average? He calls to chat in between..
If a guy only sees you once a week does it mean he's not serious about you?
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