Could try RADAR model.
www.multiamory.com
You could stop talking about it and just let natural consequences happen. If he isn't showing up for date time with you on time, he's not being PRESENT, just always in the phone doing something else?
You could say "So it's X o'clock and time for our date. Can we both put devices away now?"
Or you could cut the date short or skip it. "It's X o'clock and time for our date. Looks like you have chosen to be on the phone and are skipping our date. In future, I'd prefer a heads-up rather than being stood up." And then you just go do something else.
It's trickier in a nesting situation. You can't just up and leave and go home to your own place. You ARE home. But you don't have to follow through with the date. You could go to the dinner or movie or whatever on your own. You could go to another room in the home, or go visit a friend. But you don't have to go on the date if the dating partner is meh, even if it is a nesting partner. In future, instead of going home from work to get him, you just head right to the date location. And if he stands you up there, you do something on your own or go home.
There's a point where talking SOME MORE about things you
already talked about means nothing. You have to move on to taking actions.
Galagirl