And here comes inconsistency - from dialogues with her it shows that she’s not so sure about relationship with Tav (asking three times if you want to spent life together during different occasions).
I think you're very much misinterpreting this. It's not that she's unsure about the relationship but she has some serious self-esteem issues based on a lot of her dialogue in act 3. So she asks you to confirm it so many times because she's worried about you changing your mind about wanting to be with her not that she doesn't want to be with you.
That’s exactly what I meant but maybe worded it badly - my point is, her self esteem is low, she feels she is undeserving this relation, and then she’s okay with opening relationship? That’s inconsistent, if she wants to open it, it should be when she is secure, not when still being so unsure and lost.
Ninja, you are right, I’m just kind of sad after witnessing great game with amazing characters and heartfelt scenes, acted very well and then comes Halsin and weird stuff..