Opinion on writing her a letter after a year?

So I am graduating from high school and I still love a girl who broke up with me almost a year ago. She was my first love. It's sad how she moved on so quickly without looking the other way, but I still think about her after all this time. I'm thinking of writing her a letter saying everything I want to tell her, though I know that even a hundred lines wouldn't be able to explain 10% of the feelings I still have for her. I'm graduating so idc what her reaction might be, I just want to give it to her and if she hates me for it, she won't be seeing my face anymore, but if she likes it, she's welcome to unblock me and talk to me if she wants to.

And no, I didn't hurt her or cheat to justify her behavior. She just... lost interest, suddenly avoided me (and still does) and then broke up like my feelings were worthless.

Opinion on writing her a letter after a year?
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