Yes, she is suffering, but if the source of her suffering is her unconfirmed abusive husband, do you think cheating on him actually solves that problem or does it just feel good now for worse consequences down the line? Is prioritizing her own desires really the best route forward for her, or is she just involving the protagonist in her dysfunctional coping mechanisms by exploiting his desire to lose his virginity paired with the implicit threat of blackmail?
Do you think entering a relationship with a woman who relies on infidelity, blackmail, threats, and deception is going to end well for him? Even if you try to justify her behavior by pointing out all she's doing is perpetuating a cycle of abuse from which she is a victim, this doesn't change that she's choosing to perpetuate abuse.