how would you react..

So my boyfriend and I got into an argument b/c I told him I was tired of being disrespected and lied to. He doesn't do it often but when he does it causes such huge fights to the point he broke my door two days ago. Tonight we were discussing it and I told him how it isn't okay that he did that or what he did to cause the fight, then he starts saying "oh I can say a lot about you". I was expecting him to say something about my temper or say I was a bitch or whatever, Idk, instead he says I'm mentally unstable (which I do take depression and anxiety meds and he knows I've been struggling with this for months). Then starts saying that the baby I miscarried back in June wasn't even his. I can't believe how hateful he became and how he started putting me down for things I put myself down for.. how would you react to this :(