destiny will inevitably bring enemies or rivals together

真是不是冤家不聚头，在那场决赛中他们两个老对手又碰面了。

destiny brings together people who have frequent disagreements, especially lovers or close friends who are bound to each other

这对小情侣天天吵架却又谁也离不开谁，真是不是冤家不聚头。