I never thought I would become the protagonist of a Japanese melodrama

We started dating a few months ago,
and we have so many things in common that it feels like we met by destiny.
We were so attracted to each other and were so compatible,
loving each other deeply.
Then one day, my girlfriend fell into a coma, and she woke up the next day.
While she was in a coma, her mother sent me a long KakaoTalk message,
saying that my girlfriend has had multiple sclerosis since she was young, and asking me to break up with her because it would only lead to hardship.
Of course, I couldn't break up with her... we are still secretly dating.
As it turns out, multiple sclerosis is an incurable disease, and she might collapse in the street, experience blurred vision, or if it gets worse later, she might not be able to walk or could lose some memory (not like in the movies where she completely fails to recognize her lover).
To anyone watching, breaking up would be the right thing to do, but having lived through my thirties, I am certain that I will never meet someone again who is this compatible and whom I can love like a soulmate.
I just don't know what to do..