This is totally up to you, however, if you start on separation agreement, don't inform H to begin, and wait on him and what he wants.
If and when you decide, you start for you, and what you want, with your attorney, and then have your attorney inform them. You can think about Mediation if you so decide, and bring that up if you want.
My point is: Don't let him lead and drive that bus. You do it, because then you are not reacting to what he is doing, nor playing to what he wants. You lead from a place of strength for you, and what you want.
Ditto You're doing great... keep it up! Peace Bridge
Double ditto.
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