He is heartbroken and he feels a void inside of him, so he was trying to fill that void with you. He misses the presence of his ex and what they had, and now he is trying to cope with that by creating and rushing a connection with you so he can be over his last relationship and not feel heartbroken anymore. I think you should not think of a future with him, it’s so unfair for both of you. Find someone who is not trying to recover from his last relationship and someone who is not heartbroken.