I'm not here to criticize you, just to let u know how it really worked.
U need to show what you can contribute if u are serious about it, idea worth nothing.

If that's really a technical guy willing to committed into it, he will need to spent hundreds of hours into it, while he is investing all his personal time into it, what's your commitment which equal to his effort? You would be expected to contribute in something else, something the market willing to pay for it, e.g. marketing, get initial investment fund in etc.

I'm a technical person myself, often that's ppl come to me and just present the idea to me and expect it to be a teamwork startup. If things failed, they just walk away with no loss. What they did is just occasionally spent few hours to review the project progress and give some idea, while technical person already sink few hundred hours into it. We can earn five figures elsewhere on freelance with the hundreds of hours, you need to make the commitment fair.