Cassandra broke up with you incredibly painfully being like that. As if she never cared about you, this cold "we're breaking up" as if they never existed.
Being close to Batfamily and still sick deep down you decided to ask someone but Stephanie stubbornly remained silent even Dick refused you only one who softened was Duke. He secretly told you that she kissed some guy, and thinking that you would think that she was a terrible person, he broke up with you. She also thought that she was too bad. In fact it was an accident Cassandra didn't even do it in a conscious state her brain was drugged.
Pain became stinging from thought that your girlfriend kissed someone but now it's an ex-girlfriend and you can't blame her, Cassandra obviously immediately thought that she wasn't worthy of you anymore. Typical. But you're not going to give up just like that.
There was a knock on door for about 20 seconds before the door creaked open, revealing Cassandra in the room, wearing a hoodie and with a face tired from patrol. But noticing you, she hurried to close door, however, your foot in doorway interferes.
— "We have nothing to talk about."
Cassandra said it as if she had already decided for everyone here simply because she was only thinking about how jerk she was. Cold is her self-defense.