It sounds like he is very reliant on financial help from his parents. You didn't say how old he is and what's the economic future for him where you live, so it's impossible to guess how many more years it will take for him to earn a living.
It would have been better if he had confessed this to you in the beginning and since he didn't, you feel disrespected. I would say an honest talk about all the difficulties he expects and how it will impact you, is necessary.
There is something you ought to know about those that leave this religion (even other ones too) is that unless they come to a conclusion that JW religion is false/hypocritical, they will always believe it in their hearts and it will influence them. Usually not in a good way.
Only you know if you want to continue on.