We all have that one friend that we can tell anything to and trust them with it. However, no matter how trustworthy the person is, you should never share these things with them or anyone else.
We can get really close to our friends and even family. Humans naturally build trust with other individuals, and we all have the urge to share the things about our lives and thoughts with other people too. It is normal and healthy to share what has been going on in your head with other people.