hi SadCat, this is a very dangerous relationship in the physical sense of danger to you. Breaking your things is threatening, but choking can be a predictor of something much more serious. It doesn't matter how sorry he is afterwards, because that doesn't protect you in the moment.
Please cut contact with him for good. You may need support from counselling, family and friends, and the law if he keeps harassing you. I suggest you get in touch with a DV help service and follow their advice.
Please take this seriously.