I'm a transgender woman, and I met a transgender woman on brazilian imageboards.
We started to date, but she had heart problems.
She was at hospital, and we talked with e-mails.
But she stopped sending me e-mail since 4 ou 5 months ago. I think she is dead.
I still miss her.
I still love you, Chihiro.
This sounds great - tell people you meet online that you have a rare heart disease; if you like them then it never comes up again and you say you grew past the age for when it's dangerous, if you don't like them then pretend to die.