Your agreement is for what "Married Couples" meant when you made the agreement. It is not for what "Married Couples" means now that the courts have re-defined it.
As Abraham Lincoln said: "Suppose you call a tail a leg. How many legs would a sheep have?"
The man answered "five."
Lincoln responded "No, four. Just because you call a tail a leg, doesn't make it so."
Just because unelected court officials call homosexuals "married" doesn't make it so.
Evidently, it does make it so because you agreed to cover any legal marriage.
And you don’t need to be a homosexual to be in a same-sex marriage.