User blog comment:Qraanberry/Confused about Triss and Yennefer's relationship?/@comment-390665-20111119121209

So far in the games Triss had not really talked about Yennefer directly and made no mention of Ciri. In the books, Geralt slept with Triss (she didn't seduce him, and certainly not with magic. It was more of a pity thing). Geralt if very fond of her, but as a friend.

As for Yennefer, she is Geralt's one true love, but that doesn't he (or she!) hasn't slept with other people. At the end of the books, everyone assumes that both Yennefer and Geralt are dead, so again, if Triss suddenly finds Geralt alive, she has no reason to assume that Yennefer is too. It's only in the second game that Geralt asks her about Yen, and AFAIK, she tells him all she knows.

Triss and Yennefer are friends, but not best friends, and when Yen finds out about Triss and Geralt she is understandably less than pleased and this casts a pall over their friendship, but if she can forgive Geralt, then why not Triss also ?