Yeah we have nothing against polyamory in theory, and we're open to organically developing romantic connections with people and if that happens we will be open and honest with each other and discuss how it might fit into our lives depending on what our priorities are at the time.
But we're not looking for other connections. The relationship is beautiful and complete in itself, and there's no "lack" in being monogamous.
We just want to be flexible because life is unpredictable.