What if I break up with my girlfriend?

Have you asked her why she did this to you? Is it your problem or hers? Don't think that if you are sweet to a girl, she will accompany you for life. Think about your own shortcomings first, and then consider whether she is really hiding something.

If you are a man when it is time to break up, break up when it is time to break up. Don't be depressed. I know you'll find something better. From your point of view of her, at least you are a good person.