How can I get rid of the feeling of guilt for the abortion I committed, and the love I still feel for the girl, knowing that I am married and have children?

Summary of the answer: Satan led the questioner into loving a girl, then beautified for him adultery and abortion. Therefore, he must repent from these abominations, including the love relationship. If the girl repents, then marrying her is the best path for those who love each other. If marriage is not possible, he must turn his heart away from her.

Regarding abortion after the fetus has formed, the doctor who performed the abortion must repent and pay the blood money for the fetus (five camels) to the fetus's heirs, and it is more cautious for him to expiate by fasting for two consecutive months.