The other guy has his own project and he is kicking ass (good coder, works a lot, interested in roughly the same topics as I am). So I doubt he would switch from his project to mine, although I thought he may when we started flatsharing. I think this is a possibility if my project takes off and his flattens out, but I'm not counting on that. The most likely scenario is that I continue on my own for a while.
To both of you : solo-founding is thrice as hard. You could still team up and work on both projects. Of course, this requires serious commitment regarding the IP ( you should both become co-owners of each others IP ).