Men Only: How do you interpreter this behaviour?

Say there's this younger, good looking coworker hitting on you like crazy and you feel flattered, keep the game going. Your wife gets suspicious and asks you questions you avoid to answer or lie about. Then your wife finds out she's been sending you texts and Facebook messages that could mean either the girl is just desperately in love with you and you are just flirting for fun, or you actually slept with her and she's begging you to leave your wife. You deny anything ever happened over and over again, but your wife doesn't seem to believe you, and jumps every time you get a text and goes through your phone a time or two. You tell her she has to believe you, she's acting a bit like a bunny boiler and tells you that you undeniably hid things and lied to her, so it will take some time to rebuild her trust. In the meantime you've changed your phone's pin code and one day your wife notices that you are keeping your phone in your pocked (unusual) you get a text and she just hears the vibration (unusual, you usually have the volume on), you don't answer and at some stage you go to the bathroom for a little while...then you go out to the shop and when you get back the phone has the volume on again and sits on the mantlepiece as usual. Are you doing this (changing your pin and keeping your phone in your pocket) because you felt your privacy was violated by your crazy wife, or because you're actually hiding something inappropriate going on with the young coworker? Or both?