My friend which is a boy lost his dad a day ago and he's always making me happy and is always by my side giving me advice and lots of ecouragement
But he did't tell me! A girl (that I don't know) told me!
I don't what to say now I'm speechless

Maybe she had heard it indirectly, doesn't mean he told her and not you first. Don't be too hard on him.

You expected him to call you and tell you? He's going through a very hard time right now, and talking to other people may not be something he wants to do right now.

Instead of being upset that you didn't hear about this first hand, try to understand what he's going through. Be there for him when and if he does call you. Don't make this about you, realize it's about him and what he's dealing with right now.

No I'm not being stubborn becase I did't know what was going on so if he did't tell me
I would't been able to help him also if I do talk him he is going to feel down so I would't know what to do I'm not upset that he did't tell me I'm upset because what he is going through I think you did not understand but thank you anyway