陪伴是最长情的告白吃醋是最直接的告白
[péi bàn shì zuì zhăng qíng de gào bái chī cù shì zuì zhí jiē de gào bái]
This phrase has two parts. The first part, 'the most passionate confession is through accompanying' implies that being always by one's side is true love; 'Jealousy is a more direct form of expressing love' is the second, suggesting jealousy is an instinct behavior in a relationship.