>>92687344The use and what people expect when it comes to cuckqueens and cuckolds are not soley limited to the dictionary definition of the terms. Like most things, these words have grown over time to include a wider range of practices and applications, however, the core themes still remain. That being infidelity, loss and humiliation. And a certain level of sadomasochism, there are other themes aswell but these I feel are the most prevalent.
Just look at pic related in the OP, none of the characters present are in a romantic relationship and yet Mabel is visibly affected by the situation as we would expect a cuckqueen to be.
tl;dr
Not all acts of cuckoldry or cuckqueenery fit neatly into a textbook definition.
