He had a pretty big savings account and came from a well-off family, so he agreed to front me basically just enough to cover my rent while I worked on the app. We agreed that since he wasn't really contributing much as far as manpower or hours logged, he could help justify his stake in the ownership by contributing monetarily.
After a couple of more months, we had a working, functioning app that was about 80% finished, but we started to butt heads on some ideas and he claimed he was frustrated by the fact that the app wasn't completely finished (even though we had changed scope and redesigned the entire app no less than three times).
He used this as an excuse to renege on our initial 50/50 split idea. Instead of honoring our deal, he opted to claim complete ownership and write me out of the picture.
Another way someone could look at it: He saw the app was starting to come along and was getting actual beta users, and he got $dollar$ signs in his eyes and decided to be greedy.
Both he and I were young and naive at the time, and the whole project had essentially been built on a handshake deal, because we didn't want to spend 10 grand on lawyers and paperwork before we even had a product worth anything.
I had spent a year working on an app, barely making ends meet and living off of credit cards, but because I was trusting and naive, he was basically able to screw me over and walk away with everything. His name was on more of the paperwork and he was the primary signer on the bank account. I could have fought it, but at that point I didn't have the energy or the desire to even work with him any more.
The joke is on him, though. Without me around to actually write the code, he never did manage to finish the last 20% of the app, and here we are almost 10 years later. After all that, he never managed to get the app out of beta, and he never made a penny off it.
The end lesson I learned: Don't invest time and energy in an idea or a partnership if you aren't willing to spend the money up front to lock down the legal aspect, because by the time you have enough traction and money to lock it down, it will be too late!
Money and greed corrupts people. Period. When someone has the possibility of millions of dollars suddenly seem like a real possibility to them, you might be surprised by just how quickly they turn on you!