I think being a little jumpy is understandable, and manageable. Posting from my blackberry so I will be short.
Try to treat H like a good friend when you are around him. Keep it light and fun and don't get sucked into R talk. Plan activities around kidlet as well as for yourself - can be just going for a walk.
If D comes up, and you can't avoid talking @ it, tell H this is not what you want, but you cannot prevent him from seeking D. But, that will be his decision. Then leave it alone. And be calm.
Don"t have any expectations, just have (and be) fun and enjoy being with kidlet. This is going to take time.
