Great post 25Years!!! You bring up a really good point about enjoying the present.
Olive, I think it's great OW is putting pressure on your husband. That is showing her true colors (bit@h!) and he's bound to get tired of that very quickly. If you can be relaxed, give space, and be supportive when he needs a friend he's going to find that a much more comfortable place to be.
There is no arriving, ever. It is all a continual becoming.