Hormones hurting my boyfriend 😞

Hey ladies. This is my second pregnancy and every time I'm pregnant I say mean things to my boyfriend that I don't mean. I love him and I know he loves and cares about me but it's like an uncontrollable emotion. I tell him that he doesn't care about or love me and that he's just here to keep me on a leash. I call him self fish and yell at him. I feel unloved and take it out on him and it hurts him deeply. But sometimes I'm just so sad for no reason and start crying and lashing out. I don't know why. He said he no longer wants me to speak to him unless it's about my needs or the baby's needs since I'm always saying hurtful things. When i wasn't pregnant i never felt like this or behaved this way. Anybody please some type of insight. I don't want to loose my relationship and he doesn't seem to be understanding and I have no explanation cause I don't understand either. One day I feel loved and I'm happy and than the next day Im not.