Next day nothing was good enough for her and said she have to go home. On the same day she called me and told me that it won't work... I should leave her alone because she is not able to make me happy anymore... .
Ahead, very sad story, I hope your morning saw some sunshine in it.
I highlighted this part of your post because, although it is sad, she very likely believes this to be true. One of the hardest parts of having been involved with someone who experiences BPD traits is integrating a holistic view of the individual. They love us and have wonderful qualities and we tend to separate that from other parts of who they are. Chances are she really believes this to be true, not that is based in fact, just that she believes it is and therefore is acting on it.
I used to be a stable, supportive man full of plans ready for a beautiful life with my love. Now I sitting here alone no one by my side. I don't understand and I don't feel that I deserve this. What did I do wrong? I gave my love my heart my life and my soul for someone who may never ever existed. My feelings my thoughts and my love made her as she was. Nothing's left but pain and questions...
I may never find the answers and I may never understand why. How she is capable of to do all the things and all the lies?
That feeling of "may never existed" is shared with myself and others. We wonder how it is possible that our love existed given how we saw and felt it to be compared to how they acted, it seems to be so deeply contradictory and confusing. Know that pwBPD are afraid of emotional intimacy and are constantly in inner conflict trying to balance their fear of being abandoned with fear of being engulfed. These fears can become too powerful to manage and cause our pwBPD to act in what we see as irrational and invalidating ways. All the while to them it seems very logical and rational. Try not to judge your own experience through the lens of her actions. If she has BPD traits, doing this will distort your own inner perceptions and invalidate what you know to be the truth.
As far as the "why" of it, there are many facets to that question that can take a long time to answer. If you spend some time reading the posts and articles on this site you will begin to gain some insight into those answers and this will also help start to free you from thinking of the relationship from the perspective that it never existed.
You did not deserve this. BPD is a disorder and understanding it is the beginning of finding some inner peace and believing that you have the opportunity and worthiness to be in a relationship with someone who has healthy relationship skills.