Is it really a big secret that I left so that only immediate family and very close friends know?
You tell anyone you want anything you want. Hiding it/avoiding it lends an air of negative or shame to it. There is neither. Your strong recent actions demonstrate anything but. Live in truth. Live your truth.
H wants to hide it. Doesn't want his dysfunctional shame and failure to become common knowledge. He loses control that way. A big, desperate no-no for him to be avoided at all costs. He wants to continue projecting his pathetic charade as a "man" (pardon me,: "male") He doesn't want anyone to know his life is not perfect; that he's built and projected what amounts to little more than a house of cards, maritally. H doesn't have a clue what truth is. Or intimacy. Or much else, for that matter.
You do.
Gardener
"My soul, be satisfied with flowers, With fruit, with weeds even; but gather them In the one garden you may call your own." Cyrano deBergerac