Just dumped a girl and now confused if I made the right decision?

When someone doesn't react or they ignore you it can be worse then having an all out screaming match. When someone can be that emotionless it means that they may not care to much about you "sorry to be harsh". It also could mean that she doesn't know what to say or how to handle things depending on how she feels about you. It seems like she maybe a very busy person and that the relationship has not been going on long enough for you and her to be #1 priority on her list. I would simply say to her that you really want to be with her, but you feel like she has not made time for you or time to give the relationship a chance to turn into more. If she has to much going on then maybe its best to break it off and leave things open for a future chance to get back together when things are less busy.