1st hypothesis: If you work too hard, your girl will leave you.
2nd hypothesis: If you are poor, your girl will leave you.
We all know money is alway not enough. Therefore you are poor, you girl will leave you. So, you start to work very hard to earn more money to become a rich man. But your girl will leave because you work too hard.
It's a bad chain reaction. Bad infinite loop. Black hole.
But believe me, you better work hard, so once your girl is leaving you, you can use the money to get another one. If you poor and your girl leaved you, you are dead meat. You got nothing, no girl no money.
The conclusion, work hard and earn more money, like it or not, your girl will leave you. So better keep more money to get a wife from Thailand / Vietnam :)