The Hero Went Crazy Even Though I'm the One Who Died

As the hero's comrade, I died after blocking him from the evil dragon's breath.
Well, it's fine.
Hero Elkinas was the only friend I trusted to have my back.
I'll go out with a bang, I guess, so the hero can marry a pretty woman and live the rest of his life.
…Is what I thought would happen, but after 80 years passed, I came back to life in a completely different body.
And…
“It’s regrettable, Arlene. Elkinas went insane. Completely insane.”
That was the first thing I heard.
*
What else could I do? I need to help my close friend who seems to have not been able to accept my death, so I decided to stay by his side while hiding my identity.
This way he could completely accept the past and become happy, which is why I died for him.
But… I think he recognized me.
"You… You're Arlene, aren't you?"
I touched my face. I definitely don't look like Arlene. Shouldn't there be no way he could know who I was?
"I won't ever let you go… Ever," Elkinas said with shining eyes.