Oh, I don't disagree. I was exaggerating; of course it's comic books so an old lady can live forever.
Yes, May would have loved and supported Peter no matter what, but she would have hated this choice. That's all I'm saying. May lived her life for Peter's happiness. That he would give up his marriage, the little bit of happiness in his life that May devoted her life to providing him, to obliterate his love and his responsibility to his wife for May's sake would have been utterly horrifying to her.