Im in similar situation, my boyfriend is amazing and supportive but sometimes I just pick and pick and pick at him. Im not sure if this is to do with the BP or just to do with being a women. I ask him to ask me to stop when I get like that, and if he says STOP then I usually snap out of it and realise how *****y I was being. There are lots of times I regret what I say or do, but so far he always forgives me. I make a huge effort not to take my moods out on him, but there is always going to be an effect.

Therapy is probably a good place to start for this issue, Im doing CBT again and its already helping.