(Updated)Found out my brother almost committed suicide

I need adult advice on this so I came here.

Last night I was talking to my older brother about my anxiety and depression. (Depressions a new thing to me btw)

Long story short, he said in 8th grade (he’s now 20) he went hunting with my dad and while my dads back was turned, he put the rifle in his mouth and almost pulled the trigger. He said he’s fine now and not to tell my parents or anybody but idk what to do. I’m just in complete shock. My brothers always been the most popular kid in school, has great friends, Star football player and basketball player, blah blah blah. I just never thought this would happen to him of all people. My parents already have so so much stress in their life that Ik they couldn’t take this.

So does depression come back? Will he be ok the rest of his life or will this likely happen again??

I told my mom. She thinks he made it up to make me feel better. Idk if she’s right it in denial. But she said that’s what her gut was saying.

I am a very gullible person tho, idk.