Is this the choice you are talking about?
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If it is, it is part of the hook-up path. I didn't remember it because I was trying to recall a scene with both Ian and Lena. If this is to what you were referring, you are under some misconceptions. The hook-up path is not an open relationship. It is friends with benefits. They are friends who occasionally sleep with each other. This choice occurs because Ian loves Lena, and he is deciding if he should stop loving her. If you pick the first option, he'll continue to love her; if you select the second, he'll stop loving her. If Lena loves Ian, the next day she'll have a similar choice.
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There are a few different outcomes to the hook-up path. If Ian loves Lena and is over Gillian, and Lena loves Ian and has not slept with Axel, they'll become a couple just like if it had happened in chapter 8. If Ian doesn't love Lena and is over Gillian, and Lena doesn't love Ian, they can chose to either maintain their friends-with-benefits arrangement or end it with goodbye sex (if Ian is not over Gillian, they will always end it). Even if they continue it, it is with the understanding that they only see each other as friends and their arrangement will come to an end as soon as one of them finds someone in whom they are romantically interested. I suppose it is possible that it could somehow evolve into an open relationship in some future update, but it is outside the theme of this path and probably unlikely. In every other instance, Ian and Lena break off their arrangement and become just friends.
Does that answer your question?
