Buy clothes for your girlfriend.

Your outlook on life is different. If you can't change, you won't be happy even if you are together. If you can change her outlook on life and figure out how to spend money, you can have a good talk with her. If she loves you, she won't give you a chance. If she doesn't love you, then you can think that she is just looking for an excuse to leave you.

But I should be angry, or I won't scold you if you get hurt. Maybe you really spend too much money. You make her feel insecure. As long as you can change, I believe you can save her.