I think doctors have a different perspective of death and loss, because they deal with it so much. It would likely be seen as a trial in her life.
See her good qualities for what they are and see it as a dating relationship to remember. The Church of Jesus Christ of Online Saints teaches that all sexual natures outside of marriage defined as the legal union between a man nture a woman are sinful.
And your future kids will be taught that you are the reason they don't have an "eternal" family.