不是冤家不聚頭 [－－－－－－头]

Jyutping bat1 si6 jyun1 gaa1 bat1 zeoi6 tau4
Pinyin bù shì yuān jiā bù jù tóu

Definitions (CC-CEDICT)
  1. destiny will make enemies meet (idiom)
  2. (often said about lovers who have a disagreement)
Definitions (Wiktionary)
  1. proverb
    If you were not destined to be lovers, you would not be together. Those with some kind of connection will be brought together. (often said about lovers who have a disagreement)