Why did you have to hurt my best friend too?

I thought I was getting better, I did. Sure I still cry sometimes but I was managing how I felt.Then, I found out. I found out that my best friend in the whole world, has got depression. Out of all the people, I prayed, hoped that she would never experience such a thing. She's beautiful and amazing, and I've never known anyone as loyal and trustworthy as her. Never known anyone as strong...To find out that this whole time, she has been really just as sad as me knocked me off my feet and sent me back to square one. She doesn't know about my depression, I don't think I can tell her...it might make her even sadder and I don't want to risk hurting her more.I didn't ask for happiness, I asked that this wouldn't happen to anyone...especially her. She takes my mind off how sad I am but now that I know she's just as broken as me...I don't think I have anywhere to run to now. No one to make me forget that the world can be a total female dog.So what do I do now? Scream? Cry? Wait till I wake up from this horrid nightmare? I want to help her, but how do I do that without telling her that I'm going through the same thing?  I don't have all the answers, but maybe I'll come up with a solution to help us both. I'm not giving up until she is better.And only then will I let myself break down and cry. I have to be strong for her, and I will be. That's what best friend's are for right?They're there till the end, and that's what I'm going to do.