You need to use the For loop with a Step of 3 and grab indexes i, i + 1, and i + 2 as you go along. The ListViewItem constructor has an overload that takes a string array, use that to define the full ListViewItem text in each of the 3 columns.

Something like this:
Code:
Dim len As Integer = 3
For i As Integer = 0 To SplitArrayLength - len Step len
	ListView1.Items.Add(New ListViewItem(New String() {SplitArray(i), SplitArray(i + 1), SplitArray(i + 2)}))
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