Dont let go(Destiel)

Dean is happily living with Lisa and Ben. He has finally put Sam in Hell in the back of his mind and started living again. Dean gets a rude awakening when Cas finds him telling him Sam was let out of Hell and doesn't have his soul. Cas needs Deans help to find Sam but will Dean believe Cas is telling the truth? Will Dean and Cas get to Sam before to much damage is caused? And how will Dean take the ultimate betrayal?