Mila, One thing I have noticed about my H is that he still wants to control things. I think it's a way of trying to be part of our lives. A suggestion would be to stop posting on FB for a while if you can. He's keeping track of you there.
When you're dark, I believe the impression you want to give your H when you have to see him is polite, friendly, upbeat, but nothing about you personally. No R talk.
Be mysterious. Start carrying on with your life as if he will never come back. The more he wonders what you are doing,means the more time he spends thinking about you. Be the one your H has to chase after. Be the challenge. Give him as little about yourself as you possibly can. It doesn't seem to be in your H's case that outta sight, outta mind. It appears to draw him more to you as he can't stand it.
No way around this and I'm saying it for myself, too. It's going to be a long haul. We have the gift of time in this for ourselves though, too. Give the new tactics some time, be consistent, and then reevaluate. If it's not working you can always adjust to fit your sitch.
You have it harder because you're in business with him. Concentrate on that he is your business partner and keep it as separate from this as you can. It's difficult, but its been done before and I have no doubt that you can pull it off.