AITA for not sharing my daughters secret with my partner?

My 16 yo daughter shared something with me in confidence and explicitly asked me not to share with ANYONE. My partner overheard part of the conversation and asked over and over for me to share. I refused and he has been sulking for 3 days now about it saying that I've deeply hurt him by not sharing her secret. It isn't anything dangerous or that could potentially effect him. AITA for not wanting to break my daughter's trust??