If you choose to confront her, I would just make sure your expectations are set appropriately. If you're expecting remorse, an apology, or an admission of guilt you won't get it.
Here's what will happen:
1) She'll deny it, the more you push the more she'll dig in 2) She will demand to know where you're getting your information 3) If you tell her you snooped, she'll get angry at you for that, tell you that you betrayed her trust and make you the bad guy 4) She will make an effort to lock you out of whatever you have access to. 5) She will deepen her relationship with OM in response to things with you getting worse.
Salty, if you're ever wondering about the accuracy or the validity of the advice you receive on here, let me tell you, I confronted. Guess what happened, all 5 of the above list. Guess what didn't happen, remorse, apology or guilt. Instead she told me I was a piece of garbage for reading her messages and told everyone I 'hacked' her instagram. 'Hacked' on an ipad we both shared and knew the pass code to.
Confronting was the right thing for me to do, however, what I didn't do was be strong after it. We continued to live together, I continued to pursue, beg, plead. In fact she went and stayed at OM's the very next night whilst I looked after our S. It makes me sick thinking about how pathetic I acted. The purpose of these boards is to learn from those who have experience what you are going through. in some instances you will learn the right course of action because of what has worked fro some. A lot of the time, you will see what not to do because of someone here.
Go read Wolfman's threads, that should convince you to take on board the advice, because I can feel that you want to fight it and do what will ease your anxiety, not what will help you get through this.
Me: 41 W:42 T: 14 M: 11 S: 6
"What happened happened, and couldn't have happened any other way...because it didn't"