Haven't you been communicating? Can you understand why your co-founder is choosing the current (new?) path? You don't need to agree, but you do need to unders

Haven't you been communicating? Can you understand why your co-founder is choosing the current (new?) path? You don't need to agree, but you do need to understand what premises are leading to the decisions. Is your co-founder even aware of your disagreement? How much equity do you have? How much equity do the outside investors hold? Are the outside investors supporting your co-founder's direction? Are you the tech guy and your co-founder the biz guy? If your co-founder is so confident in the proposed direction, is he willing to buy you out? If not, why not? What about the outside investors?