So sorry you're in a tough spot right now, believe me, many of us 'feel your pain.'
As difficult as it is to wait anxiously for them to return and finally have that happen ONLY to see how tentative their return is IS very painful. BUT, I'm pretty sure it's not the least bit uncommon....I know it happened here.
Remember, when my H came home the first time last Nov?...ONLY to run again in April? He came back then BUT NEITHER of us was ready for it. MY H WAS NOT involved with any OWs at the time, he ran from the constant brow beatings and HIS OWN FEARS that we'd never ever get past all this.
So don't feel to dejected by his 'crazy' words and actions right now....he's just fighting his way out of the 'crazy world' he built around himself AND now knows he has to give it up and come back to reality and it may have ABSOLUTELY nothing to do with OW...it is more than likely his own internal struggle to live with himself for what HE has done. T2