Compersion (or, synonymously, frubble is an empathetic state of happiness and joy experienced when another individual experiences happiness and joy, and the term is regularly used by members of the polyamory community in the context of polyamorous relationships. It is used to describe when a person experiences positive feelings when a lover is enjoying another relationship
The feeling of joy associated with seeing a loved one love another; contrasted with jealousy.
It can be considered a protologism
(A protologism is a new word that has not yet been integrated into a particular language.Protologisms may have been consciously coined to name a new phenomenon or to fill a gap in the language, but may also have been an endeavour undertaken by amateurs or laymen, or by an academic, or authors depending on context in which they are in)