This chapter has me... conflicted.
On one hand, I admire the infinite kindness of Nee-san and her merciful wisdom. I absolutely love her for it, and think she's the most endearing person in this whole manga. All she said, when Raoul revealed his fiance's deceit, was "I see," with an accepting smile that showed she was ready to take the plunge with a man with a rough past she truly trusted to reform, under better emotional conditions. This woman is the real SAINTESS for that. She's an angel more pure than any other human.
On the other hand, part of me is conflicted because her choice ultimately ended up being the wrong one. He ended up never reforming, and that led straight to her being betrayed, and gang-raped to death, all while her husband, the man she TRUSTED to protect her against all odds, opted to derive gratuitous pleasure from her suffering, DIRECTLY at her expense. He didn't even try to save her, or get any help from anyone else to help get her out of that hell - the woman that gave herself completely to him, was willing to have his child, and determined to pour all of her love into him to soften his heart.
To say that his punishment was fitting is an massive understatement. He somehow magically found the one unicorn woman who would be made aware of his fradulent and criminal life he's lived so far, and still FULLY accept, love, and cherish him with ALL of her heart. Hell, she even turned a BLIND EYE to his own infidelity, multiple times. What kind of woman would be so UTTERLY understanding of his flaws borne out of a shitty hand dealt by his miserable life? Not to mention, said woman happens to be an absolute sweetheart, an invaluable quality matched only by her beauty. What in the HELL more could a man ever want?
She will never forgive him now. Imagine, the woman who literally forgave EVERY horrible thing you've ever done, and still CHOSE you as her man and husband for life, and you STILL somehow found a way to let her down and betray her, even relishing in the opportunity. The only visage of her he will ever see, from now until eternity, is her gaze of disappointment, both in him, for not only refusing to change his ways, but for actively taking delight in her suffering, and also in herself, for giving her life to a man of such lowly character, when she most likely could've fetched numerous, much better options for romantic companionship.
But you can see where she was coming from, considering he is CLEARLY capable of genuine guilt and sincerely regret for what he's lost out on, the person he took for granted - this hell loop wouldn't work to punish him otherwise. He isn't a monster rotten to his core; he's just an incredibly flawed human who definitely had the potential to change.
Part of me wonders why Raoul and sister didn't just tell him that they knew, and that they expected better and a more reformed version of him going forward, especially given her pregnancy and his eventual fatherhood. I think a man capable of this regret, would've definitely recognized the jewel in plain sight, and would likely had have a decent chance of changing his ways. Too bad they simply trusted him to make that choice himself, when he clearly would've never challenged his own status quo on his own. He's a man capable of sincere regret and change, yet incapable of moral initiative. That's the true tragedy of Bernard's character.