from your words, he is not the guy for you so dont give him more now, he stated it was not the business for him, respect that and HEAR it too. i dont mean that badly, but sometimes we dont hear the words directly spoken to us.
find and hire more guy(s), and let him know the reasons as you want to grow, dont let him in any way tell you anything other than if he is gong to keep working or quit. that is it, other wise you have nothing.
we have had many guys now that worked for us and have ran into his type, make it work for this year but on your term alone