The two-way wire-tap channel models two transceivers exchanging information in the presence of an eavesdropper from whom the messages need to be kept secret. Previous work has provided achievable secrecy rates for this channel based two techniques used separately, and more recently concurrently: one entails the legitimate nodes to jam the eavesdropper, i.e., cooperative jamming, while the other entails generating keys from the feedback signals received by the two legitimate nodes and using them to encrypt the messages. In this work, we provide the outerbound for the secrecy capacity region of the Gaussian two-way wiretap channel in an effort to quantify the role of interaction and feedback. We show that the secrecy rate loss can be unbounded when feedback signals are not utilized except for a special case we identify, and thus conclude that utilizing feedback can be highly beneficial in general. This result therefore establishes that, for the Gaussian two-way channel with an external eavesdropper, the encoders need to be designed with memory. This is in contrast to the result for this channel in the absence of an eavesdropper.