Whats wrong with me?

Im engaged. And recently started talking to my ex. Just friendly like and questions about the past. We haven't spoken in. A year. And im lying to my fiance by not telling him were talking. Me and my ex are kiking and when i go around my fiance i delete him. And I'm super jealous of any girl who talks to him. But when we broke up i didnt care and i never loved or cared about him like that?