Why does my husband say such cruel things?

I have been married for a year. Everytime my husband and I have a disagreement he downs me so bad. He makes comments about my parenting just to hurt me. He says things like maybe we should ask a REAL parent if they allow ther child to do this. Or he will call me a shity mom he knows that I love my children and treat them well and all I wana be is the best for them. He is the breadwinner and I am a stay at home mom. He threaten to kick me out with nothing. He calls me trash and a . He pays for everything so when he gets mad he takes my phone and the car keys. I am mean to him when he gets angry but nothing like him. He has even thrown his ring in the trash. But when he wants he's ready to make up and if I don't want it he starts all over again. Why would I even want to the way he treats me.when he's not mad at me he is the best he's sweet and lovable and buys me waterver I want. There is so much more that he does just can't write it all. My question is how do I stop him from treating me this way? I love him so much and we have a 3 month old together. I don't want a divorce but he makes me feel so low! He also tells me that if we split I could never get another so called good man like him. And if I do get a man he prays to god that he beats the **** out of me. But when he talks to his ex ( they have a child together ) like he's the sweetest things. He nicer to her than me. I would say he's mean about 50 percent of the time. Anyone have any suggestions about what I shoud do or any advice. Please no rude comments