This sucks and Im sorry for the situation you're in. I was in a reverse situation a year ago where I was pushed out of a company where I actually started worki

This sucks and Im sorry for the situation you're in. I was in a reverse situation a year ago where I was pushed out of a company where I actually started working on an MVP. That situation taught me a lot about core founders of any project. It showed me that founders need to be 100% committed and bought in/sold out. A few questions I would ask to gauge whether or not your co-founder was committed would be: 1. Did he invest any money into the project or just time? 2. If you quit would he run with the project without you? 3. Did you treat him like a co-founding member or like an engineer that you just found and put on the team. With regard to #1. The current project that I'm co-founding with a good friend is in a position where we are both committing time and financial resources to completing the project. Both of us are taking 100% responsibility. There is true palpable excitement as we are working on the project and we are both individually motivated to push the project forward. If either of us need access to an online product (Version Control, Databases, Software program, IDE), we'll chat about it and he or I will buy it. With regard to #2. If he wouldn't continue running the project without you, I would question how loyal he was to the project. I was offered a co-founder/CTO position a month ago and I had to be 100% honest with the founders and let them know that while I think the project is amazing and needed, I didn't wake up thinking about solving the problem. Some developers might not be able to communicate how they truly feel; An exit to another company is a clear sign that they probably weren't truly passionate about the project. With regard to #3. I met a kid who just came to San Francisco late last year and was looking for an iOS developer to build a product. I could clearly tell from conversation that he saw me as a developer building his product and not as a partner working on a project together. Every idea I had was immediacy shut down with no room for discussion and I was even told at one point that one of my ideas was "Fucking stupid." I'm not sure about your relationship with your co-founder but this may have been an issue from his point of view. I hope you find a new cofounder, one that is passionate about solving the problem that you're trying to solve.