So, you smashed a chick that you thought was a smut just for you when in reality she was just a smut. Who, after you busted in her, you gave her some bread and trusted that she would get that pill. Even though she has no commiment to you or your financial well-being. And after being shook about her having your seed, you find out that she was smashing other dudes raw and you were probably number 3 or 4 on the list. So, she wasn't chasing you as much as meets the eye.
You probably also came to the realization that if she did in fact believe the pregnancy was yours that she would've kept the child because she knew you had a promising career, which means 18 years of passive income for her. But since it wasn't and the dude she believed herself to be pregnant by had no similar career prospects, she terminated the pregnancy.
So, the moral of the story is.............you need to buy that other dude a round on the strength.
Peace