I don't think you understand how much you meant to

I don't think you understand how much you meant to
I don't think you understand how much you meant to

I don't think you understand how much you meant to
我认为你不知道你对我有多重要
希望能够帮到楼主

我觉得你不理解你对我来说有多么重要。
记得think有个否定转移的要求，不能译成“我不认为……”

我并不认为你能明白你对我有多大意义(多重要)
就这样，希望能帮助你！呵呵

我想你并不不知道你对我来说有多重要

我想你并不明白你对我而言是多么的重要.