My GF is always changing her mind about things. She has BPD and I do, too. She will say "the relationship isn't healthy and it's best if we weren't together anymore. Please understand" and then several hours later, she says, "I'm not giving up on you just yet". She self-harmed badly last night after our "break up". This has happened several times after disputes. She would say we're over and then say she was being dumb after a while. I don't understand this. She says it's splitting. I sometimes get thoughts of breaking up with her, but don't verbalise it. I really, really love her, but I'm exhausted. I told her that this kind of thing needs to stop because it's very bad for us and our mental health, especially mine. What's with the sudden changes though? And is relationship cycling common for people with BPD? 