My girlfriend often loses her temper over trifles, and she is spoiled and spends a lot of money. I don't know what to do.

Actually, you think too much about yourself. My husband and I love each other very much. I'm also the kind who can spend money, and I love to lose my temper, but willfulness is a girl's patent. You just don't irritate her when she is angry. Girls are all weather-oriented! But as long as you love each other, everything else is not a problem! You should learn to cherish each other! She lives with you because she loves you. I think girls should not be casual, but also give them to the people she loves! Also, money is saved slowly. Don't always think about saving money, but learn to enjoy it! That will lead to happiness!