Will a betrothed woman — after repenting from an illicit relationship — be accepted to marry a pious man?

This problem is a result of mixing with the opposite gender and leniency in forbidden relationships, and the calamities that ensued. It is praiseworthy that the questioner has repented from her actions, and she must continue to repent and increase her supplications. There is no harm in accepting marriage from the man who proposed to her. She is not obligated to inform him of what happened in the past; rather, it is not permissible for her to do so. She must conceal herself with Allah's concealment, as the Prophet, peace and blessings be upon him, said: "Avoid this filth that Allah Almighty has forbidden. So, whoever commits it, let him conceal himself with Allah Almighty's concealment." And whoever Allah conceals in this world, Allah will conceal him in the Hereafter.