She says she is feeling distant in our relationship, what does this mean?

I have been dating a girl for more than 2 and a half years and we have had our ups and downs but we always work things out until recently she told me that she is feeling distant and it is really putting a strain on our relationship! I don't know what she means by distance, all I know is that it is killing me!? please help!
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I've tried doing all of that! I took her away for a weekend and I've made our relationship spontaneous even wrote her a 5 page note telling her every reason why I love her and nothing has changed. The worst part is the more and more I'm in pain the more...
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i love her. it sucks so bad!
She says she is feeling distant in our relationship, what does this mean?
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