Not only do you believe incorrectly but you cannot find a single statement in the Constitution, in the Ratifying Conventions documents, in the writings of the Founders or in the logic of a Constitution which supports your incorrect view.
In FACT, the idea was explicitly rejected by Madison in a letter to Hamilton during the NY state convention. Once in the Union, always in the Union was what he said. Thus, the attempt to produce a "conditional" ratification with the possibility of future withdrawal was rejected.
North Carolina
AN ORDINANCE to dissolve the union between the State of North Carolina and the other States united with her, under the compact of government entitled "The Constitution of the United States."
We, the people of the State of North Carolina in convention assembled, do declare and ordain, and it is hereby declared and ordained, That the ordinance adopted by the State of North Carolina in the convention of 1789, whereby the Constitution of the United States was ratified and adopted, and also all acts and parts of acts of the General Assembly ratifying and adopting amendments to the said Constitution, are hereby repealed, rescinded, and abrogated.
We do further declare and ordain, That the union now subsisting between the State of North Carolina and the other States, under the title of the United States of America, is hereby dissolved, and that the State of North Carolina is in full possession and exercise of all those rights of sovereignty which belong and appertain to a free and independent State.
Done in convention at the city of Raleigh, this the 20th day of May, in the year of our Lord 1861, and in the eighty-fifth year of the independence of said State.