LRT is really hard, especially when you first start. Tuning yourself out to not knowing what is going on in their lives when you have been an integral part for so long is so difficult. In a way though, I find it better not to know for my own sake.
The thing is, in our situations, you can only take the opportunities that do come up to DB. For example when he comes to pick up the kids, you may have an opportunity there to look amazing, or to wear different perfume and to be mysterious. At the moment you should look at short term aims rather than reconciliation. Get his interest again by doing something different.
BTW with my h, he was supposed to come round last summer 3 times and do stuff in the house to get it ready for sale. He came once and then never again. Unless it is something they want to do, at this stage they will rarely do it. anything you ask will only look like 'demands'. I would purely respond to him, an opportunity will present itself. In fact, I started off my contact with h again by asking his advice on a work query. It was a neutral subject and men like to fix things and my h is all about work.