Is a wife obligated to inform her husband about her forbidden acts—such as chatting with non-mahram men online, lying to them, and sending them a picture of herself without a hijab—after she repents from them? And does her statement that she is divorced or will be divorced affect the validity of her marriage?

The summary of the answer: Continue with your sincere repentance and your resolve not to return to sins. Stay away from anything that leads to temptation, such as forbidden conversations. Increase your acts of obedience and keep good company. Do not tell your husband what happened, for Allah is Sattir (the Concealer of sins), and He loves concealment. Trust that Allah Almighty will transform your evil deeds into good deeds if you are sincere in your repentance. Ask your husband to announce the marriage to his family and to stay by your side to help you in obedience. Do not worry about your statement that you were divorced; it does not affect the validity of the contract. Remember that Allah is Forgiving and Merciful, and He is the One who guided you to Islam and repentance, so rejoice in good tidings.