Advice? When to stop chasing a client? Am I being impatient?

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Background: I've known Paul for 8 years and he's mainly been reliable. He's come through for me when I've had some hard times when we first met.

I was a web developer for many years with the app projects that we outsourced to our full-time programmer. My husband and I separated and we dissolved the business.

Current: Paul knows of my history in projects like these and asked me to build an app for him. We agreed on a price and I sent off a proposal and contract with a 25% deposit. This was Monday. He said he wanted to start as soon as possible and would have the deposit by this week. I called Thursday after not hearing back and he finally texted Thursday night and said that he was busy at a graduation, but would call as soon as possible. Friday rolled around and nothing. I called Friday afternoon saying that we were eager to start Monday and needed some details from him, but never heard back.

Anyway, I really want this project because it would be perfect for me as a stepping stone back into working. I have bipolar disorder so I had some issues with medications etc, but for the last year and a half I've been stable, just caring for my daughter and husband (we got back together).

Any strategies for closing this sale and am I calling too much? Should I let him call me? He hasn't said no and he could be legitimately busy. How do I manage the sales process better to either close this deal or get a "No"?

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