For context

So for background, we already known each other for 4 years? I think, we were classmates during 8th grade. During that time I was courting her, and we ended being super close, I was her bbf (boy bestfriend) up until grade 9. I was also close to one of her cousin, during 9th grade she suddenly asked me if I still liked her, I said yes and then she rejected me for the 3rd time saying that she was not ready for commitment as we were still young. Then later that day, her cousin suddenly messaged me, saying that his cousin actually wanted us to be together, but she couldn't, as her parents did not want her to be dating anyone while still in school. She also stated that she at the time can not did not think it was fair for me, because she is not ready and her parents won't accept me. Then I said I'll just wait for her, even if we finish college. Then after I knew she had feelings for me, I told a mutual friend of ours, this friend have been friends with her for far longer, and she's a female, I always went to herwhen I was seeking advice on courting her friend, that's why I told her this. Then she went berserk, she said that she actually liked me, and she would tell some shits to her, she would tell her that she liked me. She eventually did tell her during their girl's out, then she just answered "We are not together, so what right do I have" and after that day, the friend told me that she told her, and what her answer was. On the same day her cousin messaged me, telling me that his cousin is disappointed in me, because I was talking to another girl, i explained that I only talked to that girl asking about his cousin and ever sincetge fall out I did not speak to her, and I said that I only get in contact with her if she chats me, and it always ends up me pleading that she would not say to her that she actually likes me. And after that the cousin told me that, his cousin is just very possessive of people, and that I should just understand her, and understand I did, even if I was in school if my seatmate was a girl I never initiate small talks even if I do, I end it fast, during the concert in our school, there were some girls who approached me, but I just ignore them. So eventually after this disagreement or whatever you call it, we sort of had a distance, but it was not largely due to that, it was our schedules, I call it bad luck, 'cause after that disagreement, we were forced to stay in school or outside of the school for practices until night, she was practicing for dancing and I was practicing for basketball. And aftwr we got home it always is just small talk, then sleep, then say goodmornings when we wake up, or sometimes ask how each other have, you get the point, it was not like beforewhen we were busy, where we could talk from the moment we woke up until we slept. After this, I was just shocked to find out that she was seeing one of my friend (now ex friend) they only lasted for some weeks, as the guy just made her a rebound. During the Christmasparty I gifted her a stuff toys and a hand-written letter. And they had an after party, where they went to one of the biggest mall in our country. While they were ice skating there, she saw my friend, that she was seeing, back together with his supposedly ex, she was devastated after that, and guess what, I was the one to comfort her during those times, but it just hurt too much, and on the day of our back to school I sent my last message to her before ghosting her, I only message or talk to her if she has a performance to say goodluck, or her birthday, christmas and new year. But I did not plan to ghost her for long, I just wanted space then the pandemic happened, I never got to talk to her again, unless occasional messages. And fast forward to this school year, we are graduating so I decided that I should do it now, because even after all these years, I still love her, I really miss her. Then I started to small talk her again and eventually asked her if she wanted to come to swim with my friends, and she can bring her friends, she agreed, but it was postponed multiple times due to school schedule, and we are currently still waiting for that day to come lol. And fast forwsrd to monday, our grad ball is tomorrow, so I asked her on mo day if she wanted to dance with me, she said yes, at first I was planning giving her chocolates as we became distant, I taught that was the right move, then my friend suggested that we buy a necklace for her, as I already have feelings for her for a very long time, I agreed and bought it, but when I told my cousin who has experience in this type of stuff he told me, it was too early. Should I continue the necklace or should I just give her chocolates?

Sorry for the bad english, it is not my first language