One of the most fundamental relationships outside the family that we have in life is friendship, and in early adulthood it becomes one of the central relationships for young people. In this period, attachment to friends continues to develop, with self-disclosure being one of the means to achieve closeness. From previous research, it is not entirely clear and researched how male friendships work. Many inconsistent results have been found in various studies on the connection between attachment styles and self-disclosure, in general and also in male friendships. Research has so far focused on the differences between female and male friendships, while individual differences in the quality of friendships have been less researched in this area. Also, according to our knowledge, there is no research in the literature that deals exclusively with the male gender in the context of self-discovery and attachment styles in the Croatian sample. Therefore, the aim of this research was to examine the role of romantic status and duration of friendship, and dimensions of attachment - anxiety and avoidance in the context of self-disclosure in male friendships. A total of 477 male participants aged 18 to 35 in the Republic of Croatia took part in the research. The research was conducted online, and participants provided their sociodemographic data, data on friendship characteristics, and self-assessed how attached they are to their best friend and how much they self-disclose to him. Next, one-way analyzes of variance were conducted to test for differences in self-disclosure to a male friend by romantic status and friendship duration. Finally, six stepwise regression analyzes were conducted to test the predictive contribution of attachment dimensions: avoidance and anxiety in explaining self-disclosure. The results obtained in the analyzes showed that single men have higher levels of self-disclosure compared to those who are in a romantic relationship, and the longer men are friends, the more they engage in self-disclosure. Also, it was found that higher levels of avoidance contribute to lower self-disclosure in each area of self-disclosure, while higher levels of anxiety predict lower levels of self-disclosure in two areas – attitudes and opinion and work or study. By understanding their attachment style, individuals can improve their relationships, which ultimately leads to a better quality of life. Self-disclosure can be seen as a kind of protective factor in the context of friendships because there is an indication that insecure friendships can lead to other insecure and unsuccessful relationships.