1. "All I can see is you. Billions of stars are not as big as you. All my future stories are about you."

2. "Smile can give anyone, but your heart give me a person!"

3. "Whether it's love at first sight or falling head over heels, I just like you, only you."

4. "On this special day, I realize that my heart belongs to you, and you are the missing piece of my puzzle." [自定义]

5. "520, a day to celebrate love and loneliness. I found my love in myself, and I am grateful for this beautiful journey." [自定义]

6. "I may be alone on this Valentine's Day, but my heart is full of love for you." [自定义]

7. "Today is 520, a day to cherish the memories of love and the beauty of solitude." [自定义]

8. "Even though I am alone, my heart is not lonely, because it is filled with the love for you." [自定义]

希望这些建议能帮助你找到一个合适的文案，度过一个美好的520。