Yes, he is being immature and no, it's not obvious that he doesn't want sex if he's talking about it all the time. It sounds like he doesn't know what he wants and he has some issues to work out. And he is making things difficult for you in the meantime. It sounds like you are being generous to keep letting him be indecisive about your relationship. I hope you are taking care of yourself well enough and not allowing him to do these things if they are hurting you too much.