it has two ideas i think attached to it. 1) first is the assumption that an individual has different emotional language in each specific relationship. More specifically this emotional language is a script or more apt an outline that is a combination of societal information, information and emotional connection to parents and inclinations of the self. This is used by the individual to react to or communicate to the other. 2) each relationship has its own distinct language that influences other relationships. language- for this purpose- being the intimate communication between pair bonds that are sexually linked.
that and your physical and emotional reactions you both have to things while in the relationship. patterns you institute to for the relationship and so on.
Ok, I think you mean, like when you say: oh, we don't like that...we like to do such and such although when you were single, you might have felt a little different.