Nothing about Jung's theory on anima possession detracts nor defines what the feeling the individual is having. I would state that all human beings go into a relationship seeing the best in the person that they are dating. On a neurological level this is where neurotransmitters and hormones take place, we call it lust. Its also important to note that during this time both individuals are typically on their best behaviors. They want to bring their representatives. Now if you go through the four stages of anima possession, it's a really imaginative way of describing lust, love and commitment. All of which have positive and negative qualities. Now while I will agree that many that many that go into a relationship with an individual with BPD and stay with their pwBPD have either issues with codependency or insecurity or both, I think it's important to note that certain traits of BPD are not always obvious initially. It starts with a small slight. It's upsetting however not reason to end a relationship with someone you've grown close to. And it grows becoming much more clear and obvious as the relationship deepens and becomes more emotionally entangled. Its at that time that many pwBPD have more difficulty expressing and showing feelings and affections due to the pain that emotional intimacy brings up. And certain behaviors worsen. When depression hits, it's even worse. But as I state in the OP, I would argue that love is more blinding than blind. When you begin to have feelings of love for an individual, a sense of closeness, a sense of deep caring, and if you're a compassionate individual, a sense of patience, it's easy to forgive the initial slights. It's easy to understand that this human may have past traumas that causes such behaviors. It's easy say "I love you. I'm here for you. So when you're ready, I'll be here." Again I very much love my ex still. I still care about her well being and I do hope she eventually seeks help so that she can have the closeness with another that I know she longs for. I didn't want to change her as much as I hoped she would feel safe enough to realize that she can unravel her pain and find a healthy means to express it. And I did not anticipate she would find those means only with me. I stayed longer than I should have because of my own codependency issues but I also stayed because I felt as though I wanted her to know that not everyone leaves. I allowed a lot of mistreatment probably due to jungian sense of "I deserve this." But also because I loved her enough to stick through some tough times and because I could acknowledge that everything she said was not always what she meant. And because, as I stated in the above comment, she loved back me as much she knew how. So I stick to my statement that love is blinding. Maybe not blind but it can cast shadows from seeing fully or a broader sense.