Do you have a Board of Directors? If so, take this problem to them. If not, pitch your co-founder on the idea of bringing in a Board-- to start with, one or t

Do you have a Board of Directors? If so, take this problem to them. If not, pitch your co-founder on the idea of bringing in a Board-- to start with, one or two people that you both respect, and who you think could help you move the business forward. Conflicts between founders can turn very nasty indeed, believe me. Better to address this one sooner rather than later.