Maeve had to find some kind of good in this. She had to. If she didn't she was going to kill him then herself after setting the ship to explode to take everyone with her. She was vengeful that way.
<"I like the lie. It lets me get away with things. They're going to look at me like I'm some kind of monster because I'm nineteen and have killed people."> It was different when they were just looking at her because she was nineteen and married to Cathair. It was entirely different to be viewed as a monster.