Remember jealousy will make you angry, and at the very least passive aggressive. She'll pick up on this. If you're moody she will use it as further justification of how you treat her bad. If anything you need to be the best telemark you can be.
This way she will look at how great of a guy you are being, and how despicably she is acting, and hopefully feel some guilt.
Believe me she know that what she is doing is wrong, just doesn't understand why she can't stop herself. She is probably looking for justification for her behaviors. If you confront her she will accuse you of snooping and use it to justify herself. If you are the best guy ever she may feel scummy for her actions.
That being said if she is as you said being hot and heavy again. Expect her to start fights. Do your best to diffuse the situation. Whenever my W was feeling low she'd pick a fight just to have someone to blame but herself. Don't get sucked in!
