I worked on our idea for 3 months and finished it. At the end of the 3 months, he told me that he needed to concentrate on things that made him money and he just wasn't interested in pursuing any new ideas. Since I was poor and still living with my parents, I wasn't able to do anything with my code except use it on interviews when looking for a new job. Another company came out with almost the same idea a few years later and made millions.
The main problem was that he had no skin in the game. I had poured my life into our idea and thought about it every day. He put nothing/very little into it and was easily able to move onto something new because he wasn't losing anything. Everyone needs to take the same amount of risk in a business partnership. This is usually either time or money.
A few years later he continued on with his door-to-door computer repair company and wanted to hire me for $10/hour as a technician. At that point, I was making a salary and had a great position as a junior software developer and pretty much laughed in his face.
Our personal relationship never really recovered. We were good friends before this and at this point, and I haven't talked to him for 10+ years.