My crush reconciled with her exboyfriend whom she met and was with in high school. How long do you think this kind of relationships last?

My crush (21F) reconciled with her exboyfriend whom she met and was with in high school. How long do you think this kind of relationships last? Months/years? What chances do you give them?

My crush reconciled with her exboyfriend whom she met and was with in high school. How long do you think this kind of relationships last?
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