If your job is a problem, did you try other means of making more money? Did you try looking for other jobs?

A girl doesn't just leave because the bf has no money. She will leave when the bf is comfortable at where he is now. That means, he doesn't do anything to improve his situation. He does not put in more effort for his own good.

You must know your gf has a job too. She comes from a better family than you. Do you think she needs to depend on some guy? She needs someone who has self-respect and dignity for himself.