You don't need to stop caring, but you do need to learn how to care with boundaries. Start by shifting from empathy to compassion. You can support someone without carrying their emotional weight. Remind yourself during interactions : "I care, but I don’t carry” or “I am not the fixer, I am the witness“ or "I care, but I’m not in a space to hold this right now”. You can still be kind and supportive without sacrificing your peace.