manere

The act or process of deliberately waiting for a relationship to be over, in order for you to then start a relationship with one of the people from that initial relationship.

Considered by most to be morally questionable.

Ethan: Hey man, are Lewis and Sophie still dating?

Tom: No, they broke up. Sophie is single now.

Ethan: Oh cool, I have been waiting for them to break up. I really want to ask out Sophie now.

Tom: I don't know what to say to that. Sounds like you're going through manere.