As a boy, no matter who is responsible for the breakup, you must bravely shoulder such responsibility. After all, girls are the weaker party. Take out the courage of a boy and say goodbye to her generously. After saying goodbye, you can still be friends. It may be better without that bond. I can give you some small suggestions for gifts:
1. Since it is a breakup, you can give her a three, which also means "disperse", but it is better to part ways amicably. I hope she can take good care of herself when it rains.
2. You can also give her a small knife, which also means to break off completely. You can choose a Swiss Army knife. The quality is not bad and there are many styles. It is also better to give it to girls.
3. Give her a crystal ornament, which can be regarded as returning to the previous clean state. Everyone does not contact each other and lives their own lives. Have a good mood, such as a crystal music box, customized with her photo, which can be regarded as the last love!