Did he kinda developed a split personality? Since he wasn't totally aware of his actions.....

Good theory but it's more so depersonalization-derealization where the person had gone through so much pain they decided to unplug from reality. You don't see things like normal and your just on auto pilot basically.

Oh I think that's more like it! Because even though he wasn't totally aware he snapped out of it...more like coming back to reality...
I think if it was a split personality he'd forget the whole thing that happend...