im a idiot

I have a friend who I had seen upload some private things about the people he knew, and now I feel like it’s going to be me, honestly, I’ve always felt uncomfortable talking to him, since I know that if I say something, he’s going to post it sooner or later on some strange forum. I shared a secret of mine, and I talked too much... I’m sure he’s going to leak it (it’s nothing bad, but it’s something very private to me) and I don’t know what to do... if I block him, it’s going to be worse... I don’t know what to do, that’s why I don’t like opening up to him, what i should do? maybe its not a big deal xd