You have broken up. Whether you still have feelings for each other or not, you have to pay attention to each other. When giving birthday gifts to your ex-girlfriend, you don't need to be too grand, so as not to add psychological burden to each other. Treat her as a good friend and give her some interesting gifts with personality.
Personalized fun sun jar: Personalized fun sun jar is a very popular way of giving gifts. It can emit warm light in a dark environment, which is very interesting. You can go to a gift shop and customize such a sun jar. Very warm.
Customized luminous pillow: You can go to a special gift shop and customize a luminous pillow. The pattern can be a little funny. The luminous pillow can be used as a pillow, and it can also glow at night. It is very cute and warm.
Otherwise, you can customize an exquisite personalized jewelry, such as a name necklace, a personalized bracelet, etc. The shape should be exquisite and good-looking. But don't be too sophisticated or expensive, after all, you are already "past tense".