Keychain help? (Ignore pfp)

My friend made me a keychain of a character i really like, and i put it on my battle jacket (the button area) and i basically just looped the keyloop through the button hole? Either way that part didnt break, the chain did. What can i do about it? They're making me a new one but presents from friends are hella important to me, i try to keep them forever, so i am upset that i lost it. Any support would be wonderful as ideas for how to keep them chain from breaking with almost daily use.