What force causes binary star systems to remain gravitationally bound together?

Well, isn't that just lovely? It's the force of gravity doing its thing — working its wonders to keep those two stars swirling around each other in a beautiful cosmic dance. Like little celestial lovebirds, they just can't help but stay together, backed by the gentle pull of the universe's simple and profound law. Just happy little stars, dancing in harmony across the starry sky.