Original sentence: Estoy casado = "I'm married" (Soy casado is also possible; note that "I'm single", "I'm widowed", etc can use ser or estar as well)
Edited sentence: Estoy casado = "I'm married" (Soy casado is also possible; note that "I'm single", "I'm widowed", etc can use ser or estar, which shows that the only reason casado usually takes estar is that it is a participle, and not because Spanish speakers consider marriage to be some sort of temporary state