Since the suffix –ous means having a particular quality, therefore, you can describe someone adulterous that it is the character of that person to engage in a sex affair with someone who is not his/ her spouse.
Thus, I found out that the title has no complete relevance to the story.
فقط از تنهایی، سرمای نافذ، و وزن بیشتری که روی قلبش احساس می کرد آگاه بودژانی نمی توانست نگاهش را از فضای تهی پیش چشمهایش بردارد.
Nevertheless, Janine realized her guilt upon her momentous reflection:"After a moment..seemed to her that the sky above her was moving in a sort of slow gyration.
In the vast reaches of the dry, cold night, thousands of stars were constantly appearing, and their sparkling icicles, loosened at once, began to slip gradually toward the horizon.
So, in law, a woman is said to commit adultery when she does so ; a man, concubinage.
On the other hand, when the word inflects into “adulterous”, the word can be misleading.