Real_User, please go do something really good for yourself right now. Go for a run, go swimming, go take a yoga class, go be around people who love you. You must get yourself to a better-feeling place.
Then take a look at this video:
Video: Inquiry—Jealousy (ByronKatie.com)
Jealousy is a gigantic distortion of the truth. if this woman is cheating on you it is NO reflection on you, your worth, or your loveability.
Please take care of yourself and check back in with us.