well then she shouldnt be doing this shit to you if she said that. atleast you were honest with eachother, and didnt say the same bullshit everybody else says (baby i could only be with you...) like for real, turn that shit around on her, if not pull the "if this is all that it takes to ruin our relationship for you, then obviously it realy didnt mean much to you to start with" and dont talk to her for a week or two, she will realize that she fucked up, and she will want you back. trust me on this bro, i just went through this exact same thing a month ago coming from a 13month relationship.