If you can will it into success, break off and start your own. Have a convo with your cofounder that you aren't meshing well together and you won't be able to g

If you can will it into success, break off and start your own. Have a convo with your cofounder that you aren't meshing well together and you won't be able to go the long haul in the current setup - make it easy and you might even be able to divvy up parts of the market while you see if you were right. It sounds like you're going to be unhappy if it fails and also unhappy if it succeeds so change something.