How to make him stop texting while driving?

He's on the road 4 hours a day bc of work but he'll text me and I'll start talking and notice his typing is bad or he asks if he should pull over after like 20 minutes of talking so then I know he's driving. He won't stop!
How to make him stop texting while driving?
Keep telling him to stop (like that'll help)
Don't text him until you're sure (which isn't easy bc he probably lies)
Dig a hole, crawl into it and die.
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How to make him stop texting while driving?
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