A good title to help further his career seems like a valid concern (even if the title itself may not be legitimate), but so are your concerns. You could put the burden of finding a solution on him? Share your concerns - that you did the bulk of back-end technical work, and feel that giving someone else the CTO title would devalue it. If he can find a way to get a better title (CTO or something else) without devaluing…
Appreciate the reply. I think this is probably the best approach, however I find it hard to believe there is a possible title that he could suggest that wouldn't similarly undermine me somehow. I'm trying to avoid the conversation turning into an argument about whose done what for the company because I think it would irreparably harm our already tense working relationship, however I think without a doubt I have overw…
Sounds like you are already doing most of the CTO work and virtually getting recognized as such. Step up and claim the CTO position.