Don't try to tell me. Tell it to the Constitution -- and then see what it says back to you.
Since, apparently unbeknownst to you, the constitution neither lives nor breaths it cannot recieve anything told to it nor tell anything back. It does however provide that all rights not granted to the feds are reserved to the states. Looking at the state ratification documents which explicitly acknowledged the right to withdraw (in fact Virginia's 1861 secession ordinance did nothing more than invoke that clause of its ratification document), it is evident that among those reserved rights is the right to voluntarily leave what was voluntarily joined.