edpjrr, as I said, he is using you (I think unintentionally) as an emotional rebound. It means he isn't "into" you, but he likes having you as an emotional "pillow" on which he can count and that makes him feel somehow safe. I think he is attracted to you because, unless he is depressed or socially inept, a guy doesn't spend 7 hours a day talking to a girl he isn't attracted to.
I don't think it would be a good idea for you two to start dating, before he has gotten over his ex. Being a rebound sucks, don't put yourself in that position. I think you should stop talking to him and give him time to heal, otherwise he will always associate you with his ex and with this negative period of his life. If you two are "meant to be" and he actually likes you not just as an emotional tampon, then he'll come back once he's done mourning.