i've been in a relationship with a guy who has been diagnosed with bpd for the first time after dating a sleeve of guys who were more similar to me regarding my own malignant narcissism. now, in the beginning i wasn't aware how sensitive bpd's can be so i just went on treating him like the narcissist guys ive dated before which was rather a little harsh with constant banter that bordered on bullying and my current boyfriend admitted that it hurt him when i said certain things and now he's ignoring me after letting something slip again. 

now i'm not sure what to do and i'm concerned that he might've hurt himself? what do i do in a situation where he ignores me? if an ex did that to me i'd naturally raise hell and send him threats but this will obviously not work with him. do i just apologise?