First: You can´t pay the bill at the restaurant and this will make you look bad in front of her.
Your Ego might be beaten down while dating a girl who is not broke. Girls will cheat on you. She will friendzone you anyways. She won´t feel loved.
She will be mad if she don´t get any presents for christmas or birthday. You can´t take her on Vocations at the beach because you are broke. She will always remind you to get a work even if it annoys you