There are countless ways to express affection and love for a sibling-like friend without using the same cliched phrase over and over again. Here are some synonyms for "I love you like a brother." First, "you're my closest confidant." This implies a strong bond of trust and open communication. Secondly, "you're family to me." This phrase recognizes the intense emotional connections shared by siblings. "You're my soul mate" is appropriate if the friendship is based on emotional intimacy and unconditional support. Finally, "you're my partner in crime" for individuals who share a fun and adventurous bond. The possibilities are endless for expressing love and appreciation but be sincere and genuine with your chosen words.