you can use this code
Private Sub CommandButton3_Click()
Dim strng As String
Dim lCol As Long, lRow As Long
With Me.ListBox1 '<--| refer to your listbox: change "ListBox1" with your actual listbox name
For lRow = 0 To .ListCount - 1 '<--| loop through listbox rows
If .selected(lRow) Then '<--| if current row selected
For lCol = 0 To .ColumnCount - 1 '<--| loop through listbox columns
strng = strng & .List(lRow, lCol) & " | " '<--| build your output string
Next lCol
MsgBox "you selected" & vbCrLf & Left(strng, (Len(strng) - 1)) '<--| show output string (after removing its last character ("|"))
Exit For '<-_| exit loop
End If
Next lRow
End With
End Sub