I'm trying to go no contact but it has been difficult
I broke down every day so far and sent a text or called
She is responding some limited. And if I get deep she
Says she's sorry but she can't do this.
She moved back in with a younger girl who likes to
Drink and party.
If she does have BPD what are chances she will have change
Of heart. Couples break up and get back together at least once
Always. Although this involved her moving out.
Suggestions or thoughts on best way to proceed with hopes of
Her coming back? What is likelihood of her coming back?
Is her responding for moment good or bad? Will going total
Nc have any impact?
I can't tell you for certain, but I'd say your gut feelings are usually the ones you should listen to when you suspect BPD, although I've met a few udxBPDs who would turn on me and say I'm the one with the problem.
The hasty reactions and overreactions sound a lot like she had really low self esteem and had trouble getting through some of her emotional dysregulation.
The reason she moved out is not likely to be related to the fight you had, but rather she was feeling a lot of discomfort and pressure in the relationship already and that last conversation kind of pushed her off the edge in what already felt like a miserable situation to her. Why she was unhappy, only she knows, but a lot of people, especially those with BPD let things fester inside that they never actually admit to, or worse yet, they don't consciously recognise the reasons why they feel the stress or build up resentment. Reactions are symptoms rather than a compass leading to what's wrong.
If she has BPD the best thing you can do is
1) respect her boundaries. If she says she doesn't want contact, you have to respect it. Nothing good comes from pushing the limits, especially when it is only to comfort yourself through relationship withdrawal.
2) If she does tolerate a low level of contact or seeks it out herself, you have to be very open minded, validating and understanding. It's about encouraging positive contact and making her feel safe to express herself, even if you don't agree with her. She has a set of emotions she feels about the relationship and needs to feel that her needs are valid. She needed to leave, she felt over whelmed, and the only role you can play is to validate that it's normal to feel overwhelmed and feel the need to withdraw at times to take care of yourself and that you understand her reaction and simply care about her.
The end result can't be predicted. Only she knows what she wants in the end and she still might decide to terminate the relationship and start anew without you.