Cadenza: Yennefer is the cold and cheating one? Care to explicate further?
When it comes to Geralt and Ciri, she's not completely cold, but even Geralt knows that she learned to be cold from suffering as a child with a hunchback and then growing up as a sorceress. When he met her, she was self-indulgently exploiting a whole town and ended up trying to capture a jinn to make herself even more powerful. Later, she decides that the whole relationship thing is maybe just too complicated, so she leaves Geralt and goes looking for power elsewhere. She has an affair with another wizard because he is useful to her and she wants something from him, which is normal behavior for sorceresses. Yennefer even goes dragon hunting (indirect connection to Saskia), risking the annihilation of a species, to get something she wants. Her loyalty is also just as problematic as Triss's: on two separate occasions, Triss has to save a situation that Yennefer begins but then decides to abandon. Geralt and Ciri give her a reason to learn to be something other than what Philippa and Sile are, but it's still a learning process. If her amnesia lasts until Geralt and Triss catch up with her, we'll be seeing an earlier and harsher version of Yennefer. That will be interesting.
Triss, on the other hand, is not cold. She tries to be like other sorceresses, but it's just not in her. Sile isn't entirely wrong to call her "stupid" because her judgment is really poor sometimes, which makes her an easy target for manipulation. She "seduced" Geralt out of curiosity (except that he seems to have turned up on her doorstep wanting to be seduced) and ended up falling in love with him. She thought it would be harmless, that she could sleep with him once just to see what it was that her friend Yennefer found so fascinating, and she found out that it didn't work that way. That left her split between the two and likely to lose both. She knows it, knows she was wrong, and makes the same mistake again anyway because she lets her feelings get the better of her. Even her political involvement comes out of a desire to make the world better for everyone, not just sorceresses. She can't seem to make it work and could definitely stand to take a lesson or two from Saskia, but if everything worked out perfectly, we wouldn't have a story. "Once upon a time, they all lived happily ever after" is a little short even by today's gaming standards. ;)