Get All strings between two strings

I have a string like that :

"reasons why i love you i loveeeeee you very much,i never forget you ";

i want to just keep the string which is between "i" and "you".i wrote this code

1- love

2- loveeeeee

3-never forget

i wrote this code ,but that isn't working properly

//**************

var input = "reasons why i love you i loveeeeee you very much,i never forget you ";
string start = "i";
string end = "you";

var pattern = start + @"\s*(.*?)\s*" + end;

for (int i = 0; i <= Regex.Match(input, pattern).Groups.Count - 1; i++)
{
var result = Regex.Match(input, pattern).Groups[i].Value;
MessageBox.Show(result);
}

//*********