In Star Wars: The Last Jedi, Luke Skywalker is in a very dark place.
Actor Mark Hamill had to create a scenario that would put the character there.
When asked about the backstory, Hamill connected it to a very real world problem.
?I wrote lots and lots of scenarios. I made notes that he fell in love with a woman who was a widow and had this young child. He left the Jedi to raise this young child and marry this woman. And the child got hold of a lightsaber and accidentally killed himself.?