What does it mean when your girlfriend cheated on you and you apologized and then when you hang with your ex she gets mad?

* It's apparent your girlfriend and you are extremely immature. When two people steady date they should remain faithful to each other. Your girlfriend cheated; you apologized, but it appears that you are getting back at her by hanging around your ex. 'Ex' means the relationship is over and you shouldn't be seeing your her. Quit playing games with each other and either make your relationship work with your girlfriend or move on.