Guys, quit spamming.
It's not even funny.

Anyway, I need advice.
I recently told one of my best friends about a girl I was interested in. Two days ago he revealed to her that I was interested in her.
Now, this isn't more about the girl, as it is about trust. There have been, let's see... Only two people in my life that didn't betray my trust after I told them about something similar to the above. I don't usually talk to those two about that kind of stuff anyway.
I'm just wondering, how can you know if your friend is someone you can trust?