I am in the process of learning about my BPD, which is actually quite tough as for many years I have strugged with so many things, and never understood them. 

Anyway - one interesting thing I've learnt is that whenever someone breaks up with me, blocks me, or changes their number to move on from me, I feel terrible about myself. I feel unworthy, bad, abandoned. 

I become severely depressed, and convinced that I have done some terrible thing to them, and that they are off living a totally better life without me in it. Even if I haven't actualy done anything, this is how I feel, and I am convinced of it. 

A line from the DSM5 I found is  "they may believe that this “abandonment” implies they are “bad", which is in relation to feeling abandoned when a partner or other close person goes away - either temporary or permanently. 

That is exactly how I feel. I feel 'bad', when someone leaves me, or when someone asks for space (I used to panic at that, but have learnt to control it) - I may not show my anxiety anymore, or verbalise it, but I still feel it. 

My most recent ex has blocked me, and it has inspired feelings of deep self-loathing, and as if I did something to cause it, it MUST be my fault, etc. 

I'm curious to hear if anyone else here experiences anything similar?