Wish Tanya the best? I won't pretend that seeing her getting fucked by Akira behind Karen's back wasn't hot, but to not admit that Tanya was a scandalous bitch for doing everything she did really says a lot.
I think both Karen and Tanya are fucked up in their own way. I did not know the nature of their relationship before all this happened since I could not understand anything they said to each other. All I know is what I saw. I saw Tanya wanting to let loose and be sexual plenty of times with Karen chose to not do anything, both in this apartment and in the original. And after all this is going down with Tanya and Akira, I see Karen right now being a pest and being too naive and immature to realize that Tanya does not want to be with him. In this regards, Karen has a lot of learning to do.
On the other hand, I see Tanya being a complete and utter bitch for handling the breakup the way she did, by fucking another man seemingly behind Karen's back, then lying about it and trying to hide it. I don't care how anyone tries to spin it, she's fucked up for doing that. And even if she wanted to end things, she showed a total lack of respect.