[codegeek]

I feel sorry for your co-founder if just going by your post. Are you seriously asking this question ? If your co-founder is any good, give him access to the source code asap and move on with building the business. You are worrying about the wrong stuff.

"Once I get customers, they will be my worth"

Sure and what about your co-founder ?

"but in case of disagreement, I can't go to his laptop/dropbox/drive and delete all the codebase."

No you don't want to do that. Do we need to tell you why ?