Ultimatums are one of the best tools for people in terrible relationships to use:
"Give up the bottle, or I leave."
"Stop hitting the kids, or I call the cops."
(Other ultimatums, such as "Marry me or I kill the dog" are obviously abusive.)
In this case, the woman is forcing the man into a choice, but he still has a choice. "Show me that I'm not wasting my time or I leave" is in the grand scheme of things quite tame.
"Give up the bottle, or I leave."
"Stop hitting the kids, or I call the cops."
(Other ultimatums, such as "Marry me or I kill the dog" are obviously abusive.)
In this case, the woman is forcing the man into a choice, but he still has a choice. "Show me that I'm not wasting my time or I leave" is in the grand scheme of things quite tame.