He MIGHT just be expressing concern over the cart-before-the-horse issue. I'd echo the "build something first" sentiment. That being said, one of the hardest

He MIGHT just be expressing concern over the cart-before-the-horse issue. I'd echo the "build something first" sentiment. That being said, one of the hardest challenges to overcome is a founder with substantively less commitment than you. It's like dating/marrying a girl (or guy, I suppose) who wants to spend EVERY evening together when you still want to spend a lot of time with friends or alone... Either person who compromises has a good chance of feeling resentful. So gather an understanding. Set some initial expectations, like: "we will each spend an average of 25 hours per work a week until we hit milestone X" "we well get together 4 evenings per week to work together" "if we hit milestone Y, we will dump everything and work full time on it, borrowing money if we have to." "if we fail to hit milestone Z after 8 months, we'll close it down."