That's so sad. He sounds like a tortured soul.
I agree with Perfectly Imperfect, you are the one that can break his chains. Do you think you can reach out and break them for him? He needs someone who can see him to help. I think he will be indebted and who knows how he may help you in return in future.
I see him as a very ancient elemental who hasn't had a human to communicate with in a very long time. He is sweet but can be mischievous. I don't think you can go wrong by helping him out.
This gift of yours is a blessing, take care of it and your new friend.
love and peace