BIG DAMN RED FLAG.has got really secretive about his phone use. I try not to snoop and trust him but my gut said something was off about him so I looked in his phone (not one of my prouder moments). He's meeting up with a woman he's always sworn was just a friend tonight and he didn't tell me. He told me instead that he has a delivery he needs to make. Do I go and see if he's cheating?.
Don't say anything to him yet. Don't do any kind of confrontation till you have facts. Keep your mouth shut.
Look up Weightlifters thread on how to do surveillance. You need to get to the bottom of this pronto.