I'm glad it wasn't terrible, Dilly. And you know, you will be his attachment figure too, and he'll be having trouble letting go of you, even if it is what he wants to do. Which means nothing will change unless you change it.
I wonder if dating might do you good? It sounds like you're starved of affection, company, some flirting. It needn't be searching for another relationship, but some mildly non-platonic contact with a nice man who can be part of your GAL?
(This might be terrible advice, I don't know. I just hate to see you stuck.)
P.S I'm reading a book called Attached which is all about attachment theory in adults. There's a fair bit I take issue with, but it is interesting. I'm anxious and he's avoidant. I think you and H might be the same, even though our pursuer-distancer dynamic is the other way around...)