Just remember though, her being okay with it in the first place doesn't make any sense anyway, so no point trying to make sense about the rest of it.
She talks about cobwebbed loins if you talk to her about Halsin, however that's exactly what she has at that point, because you don't sleep with her for the entirety of act 1 and 2, and still haven't when this dialogue pops up. She even says "have your fun, perhaps I'll have mine". She literally hasn't slept with you yet and the dialogue is already indicating you both sleeping around with others.
In one of the options she also says "I'm glad that understanding is noticed, it hasn't always been with others", implying she's been the one asking for poly before in previous relationships. Which, according to all dialogue in the game, she's never had, just casual. And that "other" ironically is her herself, in act 1 and act 2.
She won't even act upon your relationship when you find out she's into you when she admits it if you do anything with another companion in act 2, and wants to break up with you for the exact same thing you'd do with Halsin. Yet with Halsin, it's a-okay and she's open to sleeping around. Complete 180 from her act 1 and act 2 writing.
It's just bad writing. The triggers where he forces himself in need to go when you don't accept him, done deal. Just see the rest of it as the inconsistency that it is.
