I am BPD2 and have put my husband of four years (together seven) through some major trials. Sometimes I wonder why he stuck around. I only recently got on a good path to stability with a new pdoc and therapist, but I still have really bad days/weeks. If your b/f is having an episode, there is not much you can do but let him go through it. It sounds like his mom is the one caring for him, so you don't have to worry about that part. Stress can make bipolar worse, so try not to add any to his life right now.