It's how long the "sweet and caring" will last. It's against a man's nature to be sweet and caring. If they do, it's called "strategy". The woman must have something to offer, and as long as she retains her "usefulness" she can expect the man to continue to "act" sweet and caring.
I believe when she ditched (or was being ditched) the 1st ex for the 2nd ex, both Singapore men, she must have said the same thing. After all, new toilet bowl new backside.