Other worlds are possible on Heaven's route. That includes worlds that could provide healing... but one that can heal both the body and the curse are difficult for him to imagine.

[His gaze drifts to the ceiling.]

He's endured many failures, and the ending he received, like it or not, was to be sentenced to die alone. It didn't matter how "good" he was. His fate was to die, and most people around him accepted that and reminded him of it whenever it looked like he might try to stray from it.

So, no. He hasn't known many people who sincerely wanted to help, or at least, wanted to help before ultimately leaving him.