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Siddhartha decides to leave the Samanas because their teachings have not gotten to the heart of wisdom. The Samanas focus on extreme ascetic practices like fasting and self-denial, but Siddhartha realizes that these practices do not lead to true enlightenment. He seeks a different path to understand the nature of existence and find inner peace beyond what the Samanas offer.
Additionally, Siddhartha is not leaving the Samanas because he realizes that leaving his parents' house was wrong, cannot continue to fast, or because the Samanas are hostile to him. These reasons are not directly related to his decision to depart from the Samanas.
