Boyfriend.CoWorker.Sex Toys.

I was recently using my boyfriends phone and a text message came through from one of his lady coworkers. Since I was on hold with the call I was on, I put the phone on speaker and went through the text thread. Mind you, I've met this girl and she clearly knows about me plus she's taken! 
So I started seeing some things that would piss any gf off!! But to be sure I wasn't crazy I began searching keywords within the conversation(sex, head, vibrator, etc.)
AND THERE WAS A WHOLE CONVO IN THERE ABOUT SEX TOYS AND HE WAS INITIATING THE CONVO! 
-Do you have any sex toys?
-Do you use them only when your Bf is at camp?
How would you confront him?