In certain circles, it is thought that in order to succeed in this life and achieve all the goals you have, you need to protect yourself from the negativity, bad feelings, and the evil eye of people around you who may affect you carelessly, unintentionally, or on purpose.
Wearing a red string bracelet around your left wrist is a tradition used to ward off misfortune and darkness brought about by the evil eye.
When the red string bracelet breaks or falls off, it is said that it has deflected and absorbed all the negative energies, and can no longer hold any more. It has done its job, so do not be concerned. Tie another one on your wrist as soon as you feel ready.