It would have been nice if both of you can talk about it face to face. but it seems like he's not ready. i understand that its hard when people get emotiionally invested. Emotionally damaged people can heal, its not a problem. And depending on the person, some need to be alone to figure things out while others prefer a helping hand. you know him better than than we do so it is up to your judgement which kind of person he is. if he hasn't truly opened up his past to you and he's saying all these things. then i'd say he's looking for an assurance A LOT of assurance that he won't get hurt this time. for your defense, just make sure he's not making a fool out of you by playing the victim card
He who laughs last, thinks the slowest