I chatted two days ago with a guy I knew before I became a Muslim on internet. I forgot myself and talked with him about sex and these things. I know I made a mistake. What can I do? He continued chatting with me and he don't know that I've become Muslim.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

You have to make sincere repentance for what you committed. Indeed Allah loves those who make repentance. Repentance means feeling deep sorrow for the disobedience of Allah, taking a firm decision not to commit that sin again and giving up chatting with alien men.

If you have embraced Islam, praise be to Allah, the Lord of the Worlds, it means subjecting yourself to Allah, following His orders and avoiding His prohibitions. A Muslim has to give up all customs and behaviours that contradict Shariah. Also inform this person that you became a Muslimah who safeguards her chastity and protects her honour. You are no longer a cheap woman who gives a chance to everyone to enjoy her or play with her.

Allah knows best.