Romantic relationships (RR) regarding attachment styles and theory have been widely studied, whereas platonic relationships (PR) have received comparatively less attention in research. This study aims to explore two hypotheses: (1) individuals exhibit more avoidant behavior in platonic relationships rather than anxious behavior, and more anxious behavior in romantic relationships than in platonic ones; (2) attachment styles in platonic relationships manifest uniquely and can exist independently of romantic attachment. This research aims to better understand the way that attachment differs between both relationship types. Through a quantitative study involving a survey with a 5-point Likert scale measuring attachment, administered to college-aged students and others, the data analysis supported the prediction that anxiousness is higher in RR than in PR and avoidance is higher in PR than in RR. As for the second hypothesis, the data did not fully support that attachment styles exist uniquely in both relationship types. This research helps contribute to a better understanding of how attachment differs between RR and PR.