What can I do to get him back?

This is going to be a two part question rolled into one.

I want to become something he can't have. I have recently notice and he confirmed it by saying it, Whatever he loves or wants he isn't able to get. He knows that with a snap of a finger I would be there for him. I want to become someone he can't have. I am overweight but I am pretty (or that is what people tell me including him). How can I get him to want me instead of it being the other way around. What do girls do to make you run after them? I am not going to bash him or turn the tables on him. I want him back!

Me and my ex began meeting again after some time and we made out and he felt me up (chest area no where else). After about a week later I brought up to his knowledge that after that day I been thinking of him. Due to mix up timing of our text message we got into a bit of an argument. Everything got clear but I told him that I have given him my heart and soul and don't and won't think about anyone but him. I am trying to win him back and I think I did a stupid thing by telling him that. Like I shouldn't chase him and except for the casual hello I shouldn't pay any attention to him. I have tried this and it did work and that is how we got back to talking again. However, this time I think I just screwed it up by telling him that I have given him my heart and soul and no one else is going to come into my life except for him. I am not trying to bring him back to bash him or anything or to turn the tables on him. I really want him back and if he wants to come back that is great and if not then I can't do anything. But I want to try.
What can I do to get him back?
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