As I have many times. Article IV, Section III gives Congress the power to create states and approve any change in their status, by implication this includes leaving altogether.
Article IV, Section III specifies how new States join the Union and specifies that States may not be partitioned without the consent of that State's legislature. This merely points out another of Lincoln's unconstitutional actions, the partition of Virginia. Article IV does not empower Congress to 'approve any change in their status'. You're not quoting the text because you're creating it whole cloth.