In the end, Liora didn't choose between the Gods, she chose all of them. In an act of defiance against the curse that had held the Gods captive for millennia, Liora opened her heart fully to each of them. She didn't need to choose because she realized the Gods were not separate. They were part of a whole, and together, their love could transcend boundaries.
The moment she declared her love for all of them, the curse shattered. The Gods were no longer bound to their separate realms. Caelum's skies merged with Vulcan's flames. Poseidon's oceans rose to meet Noctis's shadows. The four realms became one, united in love. In the center of it all, stood Liora - mortal and yet divine, a bridge between the Gods.