My girlfriend changed it for me under sexual impulse. For the first time, now she is angry and says she wants to break up with me.

In fact, your girlfriend is not prepared to accept this fact. You can coax her to do more things that move her. You should be a responsible man. You have to promise her to make efforts to give her happiness, love her for life, and tell her that when she meets someone better than you, you will bless her, because you love her, so you want her to be happy. If you do, she still wants to break up.