When someone tells you a secret about someone else, assume they’ll tell yours too.

What you are watching is not a one-off confidence, it is a habit being demonstrated in front of you. The person has shown you what they do with information that was given to them to keep. There is no reason to think your own material gets treated differently, and some reason to think it travels faster, since you are newer.

Enjoy the conversation if you like, and adjust what you hand over. Nothing has to be said about it. Just notice the pattern, and keep the things you would hate repeated for someone who has never repeated anything to you.