Do I start new biz w/H when he thinks he wants a D

[Trixi]

I'm not rookie (time wise) at this, but I haven't made any headway in the past 2+ years. My H is continually waffling.

Most recently, we were supposed to take a 3 month break from contact to see if he would miss me so he could make up his mind. It lasted about 3 weeks until I needed to discuss him helping with a down payment on the house I rent. We quickly fell into bed. But this time, instead of just getting in the same rut, I asked him what he was bringing that was different. Ultimately, nothing. He still "can't commit" to being married and all that goes with it. I feel like we have babysteps that should happen before the big commitment; I just want a commitment to forward movement.

The sticky wicket is this:
He has come up with a business idea that he wants my help on. I have all sorts of ideas to make this idea even better. I don't think it will make either one of us rich, but in this economy, any extra $ is good to have. Plus, it would be very fun to work on.

He seems to think we should "develop our friendship" and the biz would be a great way to do it, plus we'd make money. I'm afraid that I will never be able to move on if I have to see him. We are VERY physically drawn to each other and I also fear that if we deny that attraction for a long enough time, that it will die. Which is great if we are divorced. Not great if we ever hope to reconcile.

One part of me says that I should go completely dark and make him wonder and worry. (Or is that "out of sight, out of mind"?)
The other part of me says that a biz would be a great way to keep the connection. (Our kids are grown, so without a biz, there would be no reason for us to be in consistent contact.)

Is there any wisdom out there?