Boyfriend blames every angry outburst on bipolar, but it’s damaging and I don’t wanna b insensitive what do I do?

He constantly calls me stupid and useless and blames it on his bipolar everytime he does that and gets more angry after I bring it up , he has never apologized or acknowledged it or even tried to work on preventing those outbursts. For context he said i was being “whiny” when i couldn’t get a word in on a topic we were discussing so for our two year he was gonna only give me a middle finger. That was hurtful bc i can’t tell if he’s serious or not bc of how much he does this. Am i being insensitive to him or rational lmk?
Boyfriend blames every angry outburst on bipolar, but it’s damaging and I don’t wanna b insensitive what do I do?
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