We were together for 3 months ... although short, we had an amazing relationship with respect, humor and passion.
Hi, Emma81, welcome to the BPD forum. As you likely know by now from reading about BPD, those suffering from it have an unstable sense of who they are. They therefore will try to fit in by mirroring your personality and preferences for a period typically lasting for 5 or 6 months. During this honeymoon period, you likely will experience the most passionate and exciting relationship of your life. The sex will be great. And you will feel like you have met your "soul mate." Due to the mirroring, this experience will be the closest you will ever come to making love to yourself.
Your exGF does not do the mirroring to deceive or manipulate you. Instead, she is trying to act appropriately around you because, like all of us, she wants to be loved. Moreover, because she feels bad about herself, becoming infatuated with you or another person for a few months provides a distraction that gives her relief from the pain. Of course, because it is infatuation, part of what she is in love with is the "real you" and part is a
projection of you being the one who is going to save her and make her happy. That projection will evaporate in a few months and she will start to realize you cannot fix her.
I mention all this to highlight the fact that you are only four months into the honeymoon period at this point and, thus, you have seen her only at her best, when she is infatuated with you. You have not yet seen the abusive treatment that lies ahead. You may have seen some but not the worst of it. It likely will get much worse. What you experienced a month ago is called preemptive abandonment, which occurred because you exGF was so fearful of abandonment that she abandoned you so as to go ahead and get it over with.
I therefore would not consider returning to such a relationship unless there is strong evidence she will fight to overcome this disorder. That requires that she (a) is sufficiently self aware to already know she has strong BPD traits, (b) has been working hard with a good therapist to overcome it, and (c) is committed to working hard for many years in therapy.
BPD is extremely hard to overcome because the disorder makes people feel so bad about themselves that they are terrified of admitting that they have such a problem. Moreover, it distorts their perceptions of their relationships, making it hard to know when their behavior is at fault. Further, it destroys their ability to trust, making it difficult for them to believe what a therapist (or you) is saying to guide them.
My guess is that not more than 1 in 100 BPD sufferers ever achieve (a) above because it is too painful to be self aware enough to acknowledge having BPD. All the BPD sufferers on this forum are in that elite group which has achieved self awareness and most of them seem to be well along in their therapy to overcome it.
Should I lay low or should I just be a bulldoser?
If you are determined to return to the relationship, you need to learn how to establish strong personal boundaries to protect yourself. The fact that you are wanting to return indicates that, like me, you likely have a problem of enmeshment, i.e., you are inclined to perceive other peoples' suffering as your own and perceive their welfare as your own.
The problem is not that we want to help others but, rather, we are willing to do so even when it is to our great detriment. Stated differently, our desire to be needed (for what we can do) far exceeds our desire to be loved (for what we already are). If your personality is like this, it is important you learn about it. The danger is that, even if you don't return to your exGF, you will seek out another unstable woman just like her. If you are a caretaker type like I am, you will be drawn to women that desperately need you.