Yoyo so sorry to hear about S5 that must be difficult and yes you do have a lot on your plate what with the kids, work the house and now S5 in hospital not to mention the stress of your M.
When January comes I would be tempted if you are really ready to move on without H to mention the things you did in your post as in:
Who is there to give him cuddles Who is there to give him comfort Who is there to tuck him in at night Who is there to read him a story Who is there to feed him Who is there to talk to him Who is there to kiss him Who is there to care for him etc etc etc etc
Just so he see's all the things he is missing out on and all the things that his boys will notice as they get older. H can ring and talk to them but that is nothing compared with visiting them. I know he is Overseas but hey he could fly back every 2nd or 3rd weekend surely.
Sorry yoyo I am getting frustrated by your sitch so i can only imagine how bad it must be for you. Hang tuff you are dealing with alot and doing great....KDU