Moving on also does not entail completely forgetting. How we remember becomes key as does what we do through that remembrances. Our hearts will respond to things that remind them of what they hold as beloved.
If we can become comfortable with seeing someone off, we can create a beautiful loving way to cherish our last moments together.
I clearly feel no guilt over the loss of Osama bin Laden, and no grief for the loved ones who survive him. I don't even feel guilty for that lack, and this perhaps, should bother me most.