Is it permissible for someone who has been subjected to harassment and told the harasser, "I forgive you," out of fear of him, and then told him, "I will forgive you on condition that you stay away from me permanently," intending not to complain against him, to then say, "Allah is sufficient for me, and [He is] the best Disposer of affairs," and supplicate against him, while not intending to forgive him in the sight of Allah?

If you have not forgiven the one who wronged you, then it is permissible for you to supplicate against him, because the supplication of the oppressed is answered. However, if you have forgiven him, then it is not permissible for you to supplicate against him, unless the forgiveness was conditional upon a condition that was not met, bearing in mind that the supplication should not be greater than the offense. It is recommended to pardon and overlook, and to supplicate for his guidance and righteousness, for that is better, as Allah Almighty says: "And let them pardon and overlook. Would you not like that Allah should forgive you?" and "So whoever pardons and makes reconciliation - his reward is due from Allah." And the saying "Allah is sufficient for us, and He is the best Disposer of affairs" is not a supplication against the oppressor, but rather a seeking of refuge in Allah.