Should I leave him?

So, I've been married since August 2020 and that's when the beatings started. I fell in love with him some time before then after we met online. When he's sweet and kind, he's the most thoughtful guy ever! But he's recently been so distant - he's even sleeping in the spare bed. Then on Thursday he slapped me very hard across the face a few times .. my face and forehead were very sore and red. I can't remember how many times I've endured this from him now. But because of that, he took my son to his mum's on mother's day and I ended up spending it alone (it was also a festive celebration of Eid for me). I only just told my sister .. all these years after it all started and she wants me to leave him. But my whole life is here with him.. we live together and my son goes to nursery here. I'm so stuck, I don't know what to do?! Any advice.. I've just submitted a report to 101.