This is a pretty good description of the issue(s) of Lena’s alternate route(s). I would even add here the Lena/Robert story. I still can’t think way Lena should choose someone like Robert.
The whole thing is a bit unlucky. I think there would be some interesting options / stories, but somehow, they are poorly implemented or they lead to MC that you start heating. For example, the idea of Lena being on the other side of cheating, is something that could be interesting, but you need a build-up or some trigger, maybe if Ian would cheat on her or something like that. The current stories are just implemented out of the blue.
In the end you can only choose by faithful Lena, hypocritical bitch Lena or stupid Lena (Robert path). I wonder if this has been done by purpose. Strange that Eva Kiss puts so much effort in these routes, currently we have more sex scenes between Lena and Robert as between Lena and Ian….