That isn't what I call boundary setting. Boundary setting would come after that conversation. It would be something along the lines of discussing when you would see her, what you feel comfortable with her sharing with him and what you feel comfortable her sharing with you, renegotiating the time you spend together... etc... not her telling you her feelings and what men she is dating.
Crying and telling her that she can do whatever is not negotiating boundaries also. Its avoiding and letting someone lead your life by their rules... no one is at fault here but you I think... she was telling you how she feels and what has changed for her and you seemed to of bowed out because instead of standing up for what you need and how you feel you let her walk all over you and she doesn't seem to of really wanted to do that if you ask me.
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