Give him some time to explore around. He might not find anything good out there in the cruel world and come back to you.
Though, you'll need to work out for yourself, what would you do if you take him back in the future and he does this again?
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~