& the truth
Where to START. Sigyn was really obliviously happy as to who she was, she was a mid-twenties, care-free girl who was dating a nice guy (Hey Heimdall) and things were going in order. She was set to start working as a law clerk and such before Zurvan II.
Now? She's just at a loss. While she has strong feelings for Heimdall he is the man who is set to kill her husband. That is something she knows that can never be worked out, but she cannot stomp out on the way she feels, especially because it's been developing over such a long period. Sigyn is in love with Heimdall and she can't change that, even if she can try to push it away. With this in mind, she feels like she's betraying Loki, even if he's not here. Sigyn was faithful and loyal to Loki till the end, but that isn't to say she didn't resent that his games cost them the life of Narvi and Vali.
Mostly Sigyn's life has always revolved around Loki, and when she was just Aubrey it was fine, but now that she remembers she feels stuck between wanting to continue her life as before, and wanting to find Loki. This also comes with an unhealthy need to put him over her own well-being, she's been making her own life but Loki still wields a huge influence on her. There is a lot of uncertainty in what she could do, and while Freyja's advice is sound, Sigyn wants to be selfish too and be happy.