This is a tough one. One thing I know though is that business is not worth friendship. You can succeed at business with or without this guy, but you can't succe

This is a tough one. One thing I know though is that business is not worth friendship. You can succeed at business with or without this guy, but you can't succeed at being happy if you don't have any friends. For me in any case, people who think the same way I do and who I can be real friends with are far between, and though I have sometimes let business come between me and them, I've always regretted it later, because the money is no fun if you have noone to smoke cigars with. I also understand what it feels like to be demotivated and to lose interest in a project, particular when it is not released. What you have to see it as is a marriage. In the beginning, things are new and exciting, but with time, it gets boring. Some people like the boring life, but others don't. Your co-founder cannot take the grind. You need to spice things up a little bit. Is there anything at all you can release? If there is, I'd suggest letting him release it and move him away from development into sales for a while. Just developing is boring boring work, but when people start copywriting and selling, they get motivated again. To force his hand, tell him you will abandon the project. Use this as a bargaining chip to get him back into the project, and think of some tricks to get him interested again. The best way I can think of is this - release the app! Yes, it sucks, it's buggy, but when any developer worth his salt sees a released app with his name on it and it's full of bugs, he'll start working on it pronto.