When doing business, you have to look after yourself. In this case you could have been follwing what the co-founder was doing, and you should have brought up th

When doing business, you have to look after yourself. In this case you could have been follwing what the co-founder was doing, and you should have brought up that you don't consider it fair. Things are simpler when there is some simple measure of "fairness", such as salary. With equity it is always more complex, since equity also relates to the risk position, is hard to assign value to, etc.