Let's see what my conditions are. Why does my girlfriend call me poor?

In your situation, it's not that your conditions are not good enough, but that your girlfriend is too demanding. You can communicate with him well. If he really thinks so, it won't last long between you and him.

Because now he only sees what others enjoy and doesn't see what others pay. He may see other girls, living a good life, eating, drinking and having fun, but he can't see how hard others pay.