A Broken Future

Link doesn't want Zelda to throw away everything they fought for just for his happiness. They don't know what will happen when she sends him back, and it's not a risk he wants to take. Now a child in the body of an adult, Link has to deal with consequences of wanting to live in the future they fought for.
He struggles with this world they built, to learn who he is and understand himself, and it's overwhelming.
Princess Zelda tries her best to help him, but it's not something someone can help with.
He needs to grow up himself, by his own years.
He needs to go back to the past, but Link refuses to let this Hyrule forfeit its existence for his gain.
He refuses to let Princess Zelda cease to exist, just so he can be happy.