The purpose of this research was to examine how young people perceive a "betrayal experience" by intimate friends. The researcher conducted a survey with a questionnaire involving a scenario of betrayal by intimate friends among 310 female students of a five-year high school in order to analyze the types of emotions experienced, types of coping behaviors engaged in, and type of attachment style related to the performance of a "betrayal experience" by a youth. The results of a factor analysis showed that the participants felt multiple emotions such as "anger," "depression," and "uneasiness" toward a "betrayal experience." Further, "resolution avoidance," "discussion," "self-reflection," "relationship continuation," and "self-growth," were the coping behaviors engaged in after a "betrayal experience." In particular, those who felt "anger" refused to continue the relationship with the partner, and those who felt "depression" or "anxiety" were shown to engage in "self-reflection" behavior, that is, looking back on their own actions. Based on these findings, it is suggested that the way a "betrayal experience" is perceived differs depending on its contents, the extent to which one feels betrayed, and the relationship with the opponent; furthermore, this perception may be affected by attachment style and the emotional connection with a particular opponent.