I think this comic would be far more interesting if she actually had her diagnosis. May be a traumatic end, but it would add a lot to the plot.
I read another story similar in that way.
@SpiritSoy
I disagree with both scenarios.
One, where she ends up with the second lead.
Second, where she actually has the terminal illness.
Rivals are just annoying third-wheels in the end, all they do is get in the way of mutual love.