What do I do very worried?

So I found out my OH was talking to women online. But it led to us having two massive arguments. We both said things, but he said I can't look after our son, and he won't leave until he gets his own place and takes our son. So then, the next day, I just had this on my mind. He didn't seem to understand why I was upset. So when he went to the shower I took his house keys. But he discovered they were gone when we were about to go shopping. Obviously, He wasn't happy, and then he said he was going. When I was like go and he saw I wasn't begging him to stay. He sat down and refused to leave. So I left and took our son out. There were other family members sitting there, too. They witnessed him calling me names and again saying I am a bad mother, but I also said the same. Cut long story short, I was out with our son and wouldn't go home until he left. I said if he doesn't, I will be calling the police etc. So he did go, and I need time to process everything if I want us to continue. Now he apologised and I have no idea where he was staying. He said he I love you, which I don't think he ever loved me. I have never done this before. Normally, I confront him, nothing really resolved. He denies what he has done. Basically, it's swept under carpet we move on, and then it happens again. The cycle repeats, and he keeps denying things I find out. This time enough is enough. I need advice because now I feel like it's over too scared to let him back in case he takes our son. I plan on getting a residence order. I have said I would pack his stuff up for to collect. I felt at peace him not being here but sad for our children. We both have older children from previous relationships. Then we got our lo together. I honestly feel so sure it's over, but a part of me wants him back. Apart if me, like I need to stop him, keep disrespecting me, he doesn't think he is doing wrong. This why I just snapped him walking in putting down sofa bed like no care for what he did or been doing. No like I am sorry it was some explanation which was lies because he asked to meet someone in our local town. Saying send your number, and god knows if he has or hasn't been meeting various women over the weeks. He said he accepted his mistakes. Sorry now because I made him go, but it feels like he will trick me to come back and take our son. This has freaked me more out and just feels sad for our lo. I said to him go you want to be a single man. You don't love me just wait a bit longer as I will sort something then you can see our lo. Meaning I will get the order in place. I don't want to do it but he took his child from previous relationship off her mother back home from where he from. So it's hard got to hide my lo passport too. I feel sick at the thought he take my son away. After everything I have done for him. This was a relationship, almost legally married but we didn't do court weddings. This was because he needed a visa. Time after time, he hurt. I would say for the past two years, it would be like we just flat mates, and I just have had enough. Anyone gone through this I need advice.