This also explains why Geralt holds Triss at arms length in Blood of Elves. Other women he can sleep with and leave without much guilt, but Triss is different. She's a true friend, not just to Geralt but to nearly everyone he is close to as well. He can't toy with Triss's heart because she is too important to him.
Yen is aware of Geralt LOVE for Triss. He loves Triss just as much as he loves Yen, maybe even more. She sees Triss as her one true competition and only threat. The opportunity is never really explored in the books but many of us Triss fans who are also book readers wished for it. We finally got our wish with the great games CDProjecktRed.
Geralt and Triss are perfect together. They fit and compliment each other in so many ways. In the game we get to play out their relationship and see the possibilities. I have to say, I love the outcome and I am greatful to the dev for the opportunity. Honestly Geralt/Triss future together is very bright when compare to the other outcome.
Now I am waiting for the fixes to get a complete and fulfilling experience.