I have bipolar 1 and I’m a GP, I’m just here to say that not everyone with bipolar is an abusive nightmare to be around. It can make people difficult to live with and requires a lot of understanding from relatives and friends, as well as self-compassion.
I find it interesting how people seem often to be willing to put very problematic behaviour down to a bipolar diagnosis rather than the drugs/alcohol issues mentioned. These things on their own can cause very problematic behaviour and they are particularly toxic when mixed with a bipolar diagnosis. I can tell you for sure I would not be able to function well enough to be a doctor if I added drugs and alcohol to my existing bipolar diagnosis!
In terms of abusive behaviour, I agree with a PP who has said whatever the cause, it’s never ok. If someone with bipolar disorder hits their partner all their life while continuing to take drugs and refuse treatment, that to me is not all down to the bipolar disorder. In contrast, someone who is usually a great partner who hits his partner while hearing voices telling him that he needs to hit his partner to save the world, and then gets sectioned as he is so clearly unwell, treated successfully, and when well is distraught at what he has done and truly remorseful, that’s a different situation. Does it mean it was ok for him to hit his partner? No of course not? Could his partner consider forgiving this on the basis that he was temporarily insane at the time? Yes. Does his partner have to do this? No. Is it understandable if she feels this is something she’ll never be able to get over? Yes. Regardless of what happens with the relationship ultimately, was she right to move out and keep herself safe from this behaviour while he was still psychotic? Yes.
I agree with a PP who has basically said that awful behaviour that is truly due to the bipolar disorder for someone accepting of treatment (and not on drugs/alcohol) is likely to happen in acute discrete separate episodes, if it’s happening all the time it’s either someone who isn’t accepting treatment, who is actively choosing to remain messed up psychologically by taking drugs/alcohol, or whose behaviour is driven by something other than the bipolar disorder which is just being used as a convenient excuse (I see this a lot, and also see friends and relatives taken in by it). To my mind if you have bipolar disorder, difficult as it is, you have a responsibility to yourself and your loved ones to keep yourself as well as possible which means no drugs/alcohol and engaging with treatment.
I also agree with a PP who said to keep healthy boundaries of your own and avoid getting too sucked into the “drama triangle” of rescuing your mum, who has made a deliberate decision to stay in this relationship. That’s not to say you can’t be a support or encourage her to react appropriately to situations.