Don't know what to do.. 😔

So I've recently just had a baby, she was a month early and Is 2 weeks old tomorrow. So today I was out with my mum when my partner called me to ask when I'd be home, I told him I was waiting on the bus and that I wouldn't be long. He told me he was going to his friends for a drink, his friend stays the next building from us. I wasn't really bothered about him going to his friends but once I got home he started a big argument in front of our baby and then proceeded to push me around and grab my hand nearly breaking it, he walked out after that at 6pm and he's only just came home at 1.30am. I know he was in his friends cause I could hear him talking and laughing when I was at the kitchen window. Its just when he came home he was cuddling me and trying to kiss me and flirt with me as if he hadn't hit me before he went out. I sat crying the whole night not because he hit me but because my baby was in the house at the time. I don't want to be in a relationship with someone like this but I love him more than anything it hurts that he can lift his hand to me and it hurts even more that I've just gave birth 2 weeks ago to his baby and he is disrespecting me as if I'm just worthless. Please don't hate as I'm already feeling so low right now I just don't have anyone to talk to..