I don’t know what to do anymore

My best friend just tried to commit suicide and I feel like it’s my fault, he’s always been there for me and helped me get through my depression but he never talked to me about anything about his depression and I didn’t even know he was going through this, I knew he had a rough life but he was always so happy and he joked around and he made everybody around him happy. And he lives so far away that I can’t be there to help him in person, I mean there’s only so much you can say through text, I feel so useless to him and I hate feeling like this, I just want to be there for him and I don’t know what to do, I can’t believe this I’m so devastated and angry, why wouldn’t he open up to me?