Well it's a very good thing that the people who set up our constitution knew that their conventions and current intentions would not always be the correct ones, and produced a document that strives to ever push us towards alignment with their highest ideals, and not their current understanding.
You are the one not following the Constitution, nor what the Framers intended. They were not of the belief that all their understandings were the immutable truth. Their highest ideals said nothing about gay marriage, but the principles of their highest ideals lead inexorably to it, just as it lead to the end of slavery, the end to bans on interracial marriage, women's suffrage, and a whole host of changes that have made us stronger.
Obviously there is debate on any given individual measure, but to argue that because the Framers thought something it was what the Constitution actually says and means is completely fallacious.
There is nothing in the Constitution that says a dog can't play baseball.