Hills like white elephants

I didn't understand most part of this story until we discussed about it in class. It is about two people's relationship, a girl and American man. Well, the girl is not American and obviously they have a good amount of age difference between them. the girl was pregnant which i found out later in the discussion and the man wanted her to abort the baby which she wasn't happy about but somehow agreed to do it just to make things better between them. The ending of the story was a bit confusing. I couldn't understand whether she keeps the baby or she does what the man wanted her to do.