Why does stella go upstairs to eunices place?

Stanley raises a ruckus because Stella and Blanche arrive and disturb poker night with their chatter and music. After asking the women to turn the music off and not getting what he wanted, Stanley storms into the bedroom and grabs the radio, throwing it out the window. Stella hollers at him, and he hits her. The men pull Stanley away to calm him down. Stella cries that she wants to leave, and Blanche leads her upstairs to Eunice's apartment.