I was 50/50 shareholder, voting rights and co-director in a bootstrapped startup with no …

… I was 50/50 shareholder, voting rights and co-director in a bootstrapped startup with no shareholder agreement. I worked as the CTO building the product for 4 years and hired a team of 4 other developers. My co-founder hired a full time salesperson who eventually left when he couldn't make quota. I was 21 when we started the business, he was 31, and over those 4 years I just grew up to realise he wasn't a good CEO. After multiple failed attempts to raise money I eventually called one of the investors to ask for honest feedback why he didn't invest, he told me the vast majority of his failed deals happen when co-founders fall out and predicted that would happen with us too. I decided 3 months after that email to leave the business. I started a new company with a similar product but focussed on large/enterprise in that market, while the previous company was focussed more on small clients. I kept my shareholding but resigned as a director. The co-founder went nuclear and decided to dilute me out of the business by issuing new shares and buying them. …