Haven't felt so lost in years.

My gf of a year and 3 months just broke up with me. Reason why isn't super important, so I won't share it. Point is, I don't know what to do now. I devoted so much time and money and care to her that I'm not sure what things to ask for back. She has a jacket of mine. She was making me a new jacket and shirt. She has a few anime figures I bought for her. We got each other promise rings too. Her family loves me. My mom is best buds with her mom. There were so many things that we did together. We're both big fans of anime, so, we ended up watching a bunch of them together. We had plans, actually, to go watch the Demon Slayer movies as they come out over the next 3 years. Now, I'm not sure if I can even go watch them because she was supposed to be there with me. I'm a big fan of romance animes, and I feel like I can't watch them any more because they remind me of her. I don't know what to do. I'm scared. Valentines is just around the corner. She was supposed to plan that date. Now what do I do? Where do I go? Everything was perfect 2 days ago. How did it all fall apart so fast? What do I do?