Are we talking about Istredd? Our favorite TeamTriss chapter.

No need to over complicate things in this chapter. Just try to understand women.

She had Istredd, the man who understand her, was her like-minded person (both sorcerers) and most importantly he loved her. We can't say how happy she was with him, but she was confident and tranquil with him. Basically you have someone who can undestand you, someone who give you the future.

On the other side, with Geralt she found the maddest and the most passionate kind of love which like a tornado mixed all her life.You can not be sure about your future with him, you can not be sure about anything except you love him and he loves you with sort of real mad love which even more hurts. But you need it cause only with that mad love you feel yourself really happy.

Now put yourself in Yen situation. Try to Choose. Love or life. Sounds, easy right?

So can we blame her for the fact she was not ready to decide? Not really. It's one of the most hardest choices in her life. Per contra her experience told her that confidence in the future is really important. It's crucial point of her character development.

Can we blame her for cheating Geralt Istredd? Maybe. But we know Geralt ruined her previous life in Vengerberg. And it was a dick move.