Thanks everyone for the advice,
I live in Japan. They have pet shops but no doves. I've tried to release it and kept it outside but live in a city so I don't have a big outdoor area to build an aviary unfortunately. I talked with vets and rehabers and tried to release him but he would just come back after an hour and sit in the corner near the apartment for the rest of the day and not eat. The rehaber said he was probably too imprinted and would not survive. I tried to keep contact to a minimum while raising him and took him to parks but he never took to it. I never planned to keep him but don't have the heart to euthanize him or have him starve or freeze to death at this point.. I guess I'm selfish but He seems happy and relaxed and likes to be near me but doesn't like to be touched. Probably because I tried not to touch him much until discovering he was not fit for release. After that I handled him often but recently he's been testy. If you have any more advice that I could use please let me know.