I also think it’s rude…unless he is a physician on call, in the President’s Cabinet and the US is being invaded by Venusians, or he was married before and he gave the babysitter the number because of his kids. Even so, he could say,“Excuse me, I just have to check my text to make sure my children have not set the house on fire.” Check the text, no emergency? Then, put the darn phone down, already!
If there are no kids, no Venusians and no emergency rooms involved….a person should leave their phone in their car or turned off completely during a date.
Is he that into you? What do you think? I just think you may want to consider whether you want to be that “into” him. I feel it was just inconsiderate.