Rachael, I'm glad your anniversary plans went well. Just a small reminder, keep your expectations at zero. I don't want to see you disappointed if he goes back into the rabbit hole again.
Your h was having a difficult time not only w/your anniversary, but more importantly the anniversary of his father's death. Death and serious illness are two areas that the mlcer tends to shy away from in most cases because they remind him of mortality. Going to the cemetary brought the emotional pain back to smack him in the face. As long as he stayed away from the cemetary, he could pretend that his father was off on a trip or something, his death didn't seem real until he went there to visit.
I'm sure it was a difficult day for him and he had to run away to a different environment for a while.
On another note, how are you and your children doing? Do you have plans for the summer?
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.