So what she says that backs you up if you ignore the rest is true, and what she says that proves you wrong and blatantly states she's mono is just her lying?
Ok.
I responded to that earlier. SHE IS NOT SAYING SHE"S MONO. She's saying "not with X, not as a secondary"
You do realize that the you are the one arguing against the dialogue in the game, right? You are reading monogamy into a person who clearly expresses an interest in having others in the relationship. Halsin doesn't threaten her, Wyll does. Wyll would demand monogamy.