His possessive behavior, like demanding to know her whereabouts constantly, was a major red flag.

possessive 是由动词 possess（拥有、占有）加上形容词后缀 -ive 构成的形容词，意思是"占有欲强的、表现出强烈占有欲的"。这个词常用于描述人际关系中过度控制或独占的行为。