This master's thesis deals with transnational intimate relationships, their sustainability, and emotions, since they are the ones that play a key role in maintaining said relationships. The main goal of this theoretical work is to determine and describe all aspects of transnational intimate relationships and determine the factors that contribute to their sustainability. Simultaneously, this paper relies on the work of numerous other authors who previously dealt with this topic. Considering that it is important to pay attention to individual experiences, and since there are no universal rules that could apply to all experiences, this work aims to lay the foundation for future research on the practical application and evaluation of emotional communication systems, intimacy, and sustainability of these relationships. In addition to individual experiences, it would be important to bear in mind that culture, age, socio-economic status, gender, and sexual orientation can influence the dynamics and durability of a relationship.