I am a Muslim married man, but have had illicit relations with many women, most of them Muslims. With one particular woman, I had prolonged relations. She became pregnant. Upon discovery, we aborted the child. She wanted to marry me afterwards but I could not as I did not want to hurt my wife and children. Even then she wanted to continue the relationship and we had sexual relation many times afterwards. I have recently broken off relations with her and she is very angry and says that she will never forgive me for toying with her. Allah knows that I only broke off as I wanted to redeem myself, I have stopped all such nonsense but am very worried and do not want to go to Hell. Please guide how can I.
Alhamdulillah that God has given you the courage and will to repent.
The ideal scenario in this case would be that you marry that lady. Please consider this very seriously because this could save her life being ruined.
However, if that is not possible because of your circumstances, then you should at least ask her to also repent from she had been doing and tell her that this relationship cannot go because you have realized that is against Islamic directives and that you want save yourself from the wrath of God.
If she is someone who is not able to support herself now or in the near future perhaps you can continue to help her as best as you can.