Sun, I don't post much lately but I always keep up on the ones I have become close to over the years. It sounds like you have gotten back on the rollercoaster with your H, or instead of him.
I know that I couldn't do what you are doing with H living at home like he is. It takes sooooooo much strength to have the fact that they don't care about you anymore pushed in your face nearly every day.
Of course he is looking for a mother figure. My H didn't have a good relationship with his mom, he has always tried to replace that fact with "things". But like Snodderly says, he doesn't want you to be that mother figure. Maybe you were somewhat in the past and that bothers him, I'm not sure.
I myself have come to some conclusions that seem to have moved my life forward and I think I can see where the path is leading me, for now at least. If I ever get time and get brave enough, maybe I will post about it all and see what others think.
Just from meeting you on the bb, I know that you are a loving, kind, caring compassionate woman, who has much to give. Just try to concentrate on you and ignore H and his much younger friends.
I wish I was closer, so I could give you a hug because you really sound like you could use one, and for that matter so could I.