<human>: Could you distill the essence of the text into 1-3 sentences?

My fiancé  (F/21) and I (M/23) are having problems. We have fights but most couples do. The thing is she will not let the past go. She will bring up girls I've dated in the past and said "I be if I was *ex's name* you'd do this." And it's not true. She is also convinced that I'm going to leave her for my ex girlfriends which causes her to be upset and want to break off our engagement. The fights last between a day to a day and a half.

The truth is I love her and I just want this to stop. I want us to stop looking at my history of bad decisions and her history of bad decisions and make peace. Any advice would be appreciated. I definitely don't want to end things with her.
<bot>: Fiancé and I fight all the time because she thinks I'm going to leave her for an ex that I haven't spoken to in years.