Sounds like he is already dealing with it best he can without the official diagnosis. If you trust him, tell him. And, do not believe that nothing can help, you can help you. In time. I am sure he is fine, but no one is perfect. I am sure he has his own concerns, perhaps even things he has not told you. Try to slow down a bit, enjoy, and focus some on him. (maybe you do but I'm just not hearing it)