B...Don't be ruined! She's opening up to you...that is good. Validate it. Really try to understand what she means by 'this different person with you'.

She is so confused...not certain of what she wants...don't think of that as over. On the contrary...I think this is the beginning of you two finally beginning to talk about the root of the problem. See this as a huge step forward...not backward.
Try to keep it about her and her feelings...not about yours.

Look for the small positives. Don't get defensive. Validate how she feels. Ask what she needs/wants from you. What is missing for her. Go back to the DR and read what to do in this situation.

I wish I could be more help!!
J~

M 35
H 29
M 4 yrs T 9 yrs
D 3
S born 10/19/07
Bomb 09/10/07 Separated next day
OW - broke up and H moved out 09/07/08
Status - still figuring this out