I struggle also with wondering if I can forgive W in the future for everything that has happened. As Zephyr said before, you will eventually for yourself anyway. Its the only healthy way forward.
What helps me is to avoid thinking about it too much right now, forgiveness isn't something you can do overnight, its a long process. Its also very difficult to do when damage is still being done by W.
If/when she comes back she can help with that process, if she does the work. For now focus on you and making yourself the best version of you that you can, then you cross those future bridges as they come.
Accept what is, let go of what was, and have faith in what will be
