Hi Maybeep. Just read through your thread and you are dealing with an incredibly tough situation extremely well. From your first post to now you dealing with it much better and are accepting that you can't control your W
IMHO you are accepting your part in the M breakdown and that's a major step but don't try and take all the blame. Your Ws illness must be very tough for her and may / may not be an influence in all this. Cadet has provided his excellent homework and others have offered sage advice.
Deal with your reality , that doesn't mean you have to like it or want it but dealing with it allows you to move forward and not stagnate Things can change in a heart beat in our lives and the next chapter in your story isn't written yet. You have control over you so use that to its fullest. Do things for you , improve those areas of yourself that need improving. Enjoy your life , yes a large part is cr@p right now but know whatever the outcome things will be good again