Just had a breakup but I am confused and lost?

long story short I’ve been with this girl for a year now. She’s everything I want, and I can’t see myself with anyone else. I’ve never had these feelings before. I do a lot for her, help her around her house, we go out and grab food a lot, and I take care of her. Basically everything you’d want from a significant other, I gave her.. unconditional love, I care, I want her to be better and succeed. she didn’t always reciprocate (never even said I love you).
She has broken up with me saying she can’t give me her all, and that she hasn’t healed from her insecurities of her last relationship. Says she doesn’t know what the future holds but she can’t be with anyone right now. I’ve consistently stated I want to be there for her in any way. I ended up writing her a letter and left it for her at her house to read. This letter was all my love confessed to her and anything you’d want to say to someone you love. She said she read it and is metabolizing it, and it’s been about 3 days. I know it’s not that long, but should I even reach out again at any point, or should I let it be? I’m completely shattered and don’t know what to do.

-Thanks

Just had a breakup but I am confused and lost?
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