I am a common man unaware about law.

I am a man (27yrs old) , I was in a casual relationship with a girl, I never thought anything about getting married. I never wanted to get married to her, it was just a casual relationship. Whenever she asked about marriage I was always clear to her, that i will not marry her and I am not that serious about that relationship. Now the problem is, in the month of November we found out that she faced ectopic pregnancy. Ectopic pregnancy is when pregnancy takes place outside the uterus, it took place in her right fallopian tube. Whenever ectopic pregnancy occurs, the baby is already dead and the threat of this problem is that it leads to a fallopian tube which can burst leading to internal bleeding a
and once the tube bursts it can be life threatening. So doctors usually advice to get rid of the tube before the tube bursts. Therefore we had to go for surgery and she had to remove her right fallopian tube. the surgery was a success, now the problem is now she and her parents are forcing me to marry her. Within my heart I know that I never wanted to marry her. If I marry her it will just be out of sympathy and if i Marry someone it should be because I want to marry her not because of sympathy. so i don't want to marry her and I told this to her and her pay but they are forcing me to get married. what can I legally do?