It reminds me a little of when Val's 'Sister' arrived to stay with her and Jul - A third party arrives, and something happens that splits the original couple.....Only this time round, it is the 'couple' who are sticking together on cam.....But NOT to start again.....Just for the job.
We saw how angry Sayn was at being lied to - Now whether that was because she slept with Leech full stop, or just because sex in the apt WASN'T agreed to - So how can he trust Elli again on pretty much anything?
What Elli said in that translation is SO TELLING - When she said she didn't regret it, but if she could change things, wouldn't have done it. That is a total contradiction in itself - What she IS saying is "I don't regret having the affair, i wanted it - But i should have done it differently".....Meaning in the REAL WORLD, she would have left Sayn by now....
It's like Sayn said "I agree to 3 things on this list of 4, but i DO NOT agree with number 4"....And she did number 4 anyway.....
By no longer being a 'real' couple, Elli can see doing anything after this as not actually 'Cheating'....And that's something Sayn can't argue with.