The deus ex machina, or "god from a machine" is a hack literary trick where the problems of a plot are resolved at the end of the story by the sudden introduction of a new element.
The word is Latin but it has its origins in Greek theater. A Greek diety would be hoisted on stage with a mechane where a scene called for the diety to be in flight.
Yes it is a plot device It is latin for "god out of machine".It is used when the problem/crisis of the story is solved abruptly.Example:A new character coming out of nowhere and ultimately resolving...
A simple example of the "Deus ex machina" motiv: In Sophocles' "Philoctetes", Philoctetes is about to hurt Ulysses and his son Neoptolemus, who came to the island of Lemnos, where Philoctetes was...
That would depend on how you feel towards them. If you are not interested in them anymore simply tell them how you feel and that its best they move on. If you are still interested talk about things...