You probably didn't mean to phrase it as "technical vs nontechnical", and more so your friend but it could come off that way for some.

This is more specifically your friend not doing his job than it is about a nontechnical vs technical person, just that he happens to be the person that was suppose to be responsible for the non-technical parts of the idea right?

My advice is if you're clearly not happy with what he is doing, cut him loose, move on.

If he's pretty much a drag, I'd say drop him. Your partner must share the same vigor as you do in building up a business.

Edit: I remember partnering up with a close friend of mine to build a website. He kept procrastinating simple tasks which got me frustrated. It was even hurting our friendship. I finally worked on the tasks myself and never brought up serious website discussions with him again. We are still good friends now, though.

My advice is stop looking at him as an involved "nontechnical person", and start looking at him as a friend again, only one who is currently not helping you, and maybe even leeching off of you, to some extent; cut him loose.

He's either de-prioritized what you're doing "together" or he's just talk, either way don't start with someone who isn't or can't or won't be as committed as you.

It sounds like you already know the answer.