Yyeem to be evading the question, so I'll ask it more bluntly and provide pre-formatted responses.
Did you ask your partner to stop texting and driving? (Hint: this is a 'yes or no' question only, there is no credit for things like, "I hinted at it" or "I offered to drive".)
YES or NO
If you answered YES, great! You did the right thing. And if you already addressed the problem with them, and it continues to be a problem, then you may be justified in bringing it to a supervisor.
If you answered NO, then you probably made a mistake. Unless the issue is VERY significant (theft, narcotic diversion, abuse, sexual harassment etc.) you should always address the issue directly with your partner.
Not only will talking to them directly generally correct the problem, but you'll show both your coworkers and your management that you are confident and competent, and not 'that guy' who brings every little problem directly to a supervisor.