The beginning of my H starting to turn around was when he felt I didn't need him and that I was moving on without him.
Once he started feeling this, he went all kind of crazy like and that is when the whole irrational behaviour began up until he finally exploded moved out then chased me and we had the big conversation that brought us back together.
Just keep going as you are, don't make any sudden moves back towards him, but don't be too distant or unfeeling toward him either, yuou have to strike the balance of being friendly without pursuing but you don't want to seem cold either.