Marceline had mixed emotions right now. She felt so jealous, angry, and anxious. The woman whom Kira loved finally showed up and according to Kira, Serena didn't betray him.
She felt comfortable and close to Serena after meeting her for the first time. She had never thought that she was her rival when it came to conquering Kira's heart.
She saw how Kira got furious when Dominique tried to hit Serena a while ago. He protected her and he showed his worries and concerns towards Serena.
Marceline's expression was glum. She envied Serena for being Kira's first love. And she hated her, knowing that Kira got hurt because of her.
No matter what reason that woman had, if she truly loved Kira, she would never let anyone hurt Kira. However, she did it. Saying she was left with no choice, this was not a valid justification for her action. She always had a choice! She just chose to hurt Kira!
