Nuke, I am going to be blunt. Her world does not revolve around your feelings. She is not 'spitting in your face' or disrespecting you or anything else that has anything to do with you and/or your past relationship. She is living her life. You need to live your own.
What you are experiencing is a part of breaking up. It would probably happen whether she waited one week or two years to date again. It is a reminder that she isn't yours anymore. It is proof that the relationship is definitely over and it is time to let go.
You will be a lot happier if you don't think of moving forward as a denial of the past. It isn't. Moving on isn't forgetting the past. It is accepting that it is the past. You've got today and the promise of a great tomorrow ahead of you.
You hit a low point on roller coaster of healing. Instead of dwelling on the pain and betrayal get out and do something that helps you feel better like meet up with friends, go fishing, exercise, garden, etc. In other words, get out of her life and get involved in your own.