My favorite terrible thing to do to a character was have this young woman basically start a war for the sole purpose of finding her sister, only for her sister's ex boyfriend to tell her, once it was far too late to stop the upcoming battle, that her sister was dead.  And he knew this.  And he didn't tell her from the beginning.  Because he's the one that killed her.
And he killed her because the sister was getting increasingly extreme and violent and she was intent on blowing up a city full of (innocent?) aliens.  And he had to make that decision, her life or all theirs.
All she gets is to carry her sister's body home.
Gosh I love how horrifically cruel that story is.

That would be some grade-A high quality denial, if he still managed to have it after they slept with each other again.
Elizabeth wouldn't have that denial.  Which could make it very painful if Jaspin was still in denial.  Sleeping with the love of your life again only to have him tell you it was a mistake and he didn't care about you anymore?  Ouch.