Spoiler for ep6:
First she kisses and gropes Siesta and in this ep she kisses Anies! Looks like Louise is as big a cheater as Saito is.
As for the preview, I hope that short clip of Siesta in a school girl outfit wasn't just a dream sequence. Can anyone who's read the novel confirm if it'll actually happen?
On a side note, the last 3 eps have ended with Louise screaming at Saito while the camera pans up, I think it's time to be a bit more creative.