I think there are some positives to H moving out (mine as well, he just won't leave!). You can stop walking on eggshells, schedule your own day, and have space to relax. Not seeing the raw details of the A every day will be nice too. Will it be hard? Oh yes.
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and tell him I hope he will be happy, but he is always welcome to return if he is not, as that is how I feel right now
I am no expert, but I would word this differently. Maybe say "Your happiness is important to me. I still want this marriage and think with hard work from both of us, it could work." That way you aren't giving him a 'free pass' to just come home.