Is ebola curable? if so, why are so many people dying from it?

Treatment: It is treated supportively. Currently there isn't a cure for Ebola virus. The patient may be hospitalized, placed in isolation & provided intensive care measures: oxygen, medication to maintain blood pressure, blood transfusions (platelets or fresh blood), intravenous fluids & electrolytes & treatment of co-existing infections. Zmapp is a biopharmacuetical drug that is being used experimentally.

Difficult virus: Ebola is highly infectious and spreads rapidly in the body of those exposed. Survival requires advanced support in a hospital type setting, and a personal immune system which can be activated by the conditions of virus infection. A vaccine will eventually be found. Since the conditions for survival are so specialized currently, many will die until the virus is contained.

Maybe: You can survive. There is no known proven "treatment". There are therapies and numerous have survived. For the most part, the approach is what we refer to as "supportive care".