You posted on Mark Evolving's thread saying that your main interaction with H is re the kids and that you don't see him too much. Your baby step goal is to have him talk to you about something other than the kids.
You have to make the most of the opportunities when you do see him. How are you when you see him? How are you usually dressed? Are your outfits predictable? Is your makeup the same? Have you changed anything about your appearance? Are you usually upbeat? Does he pick up the kids from your house or can you meet somewhere else and strike up a conversation?
It may be worth it to try something different. Something to captivate and spark interest. The first thing to remember is that men are visual creatures. Make sure that you are smelling great as well.
You can make a big, new impact in a few minutes. I haven't read alll your sitch but I will , so if you have been doing any of these things already, we will come up with a new plan.
BTW, my H and I usually pass like two ships in the night but there were two occasions on which he commented on my appearance. Once was when I changed my hair in a major way and he said "Did you cut your hair?" Nothing more, but for him to even acknowledge that he noticed was big at the time. Another time I was wearing a great new suit and blouse and when he saw me , he said "Nice." Nothing more, but again, big at the time.
So, they do notice how you LOOK even if they don't say much.