Separation in marriage?

What are everyone’s thoughts on separation while married?

My husband and I have been married for 5 years, and we are constantly fighting. We had a huge fight a couple of days ago, and he said, “i don’t want to be with you anymore” to my face. I was HEART broken. He eventually took it back and said he didn’t mean it, but he has said this 2 more times in the last month and a half. He has trust issues(No reasoning behind them), and he has always treated me and our kids badly. He cusses at us, yells at us, and he gaslights me every day. He’s narcissistic. I can’t talk to him about anything without him turning the situation around and making me feel bad and making himself the victim in the situation. So, since we have these issues, and he said he didn’t want to be with me anymore, I suggested we take some time away from each other since he literally told me he doesn’t want to be with me anymore, even though, he took it back. This has been going on for years, and I have offered marriage counseling, and he refuses counseling because “he doesn’t believe that other people can tell him how to be happy”. I’ve exhausted all other options to get this to work with him. I also am very understanding that I am not perfect by any means. I have some things to work on too, and that is why I suggested separation so we could work on ourselves and really dive deep in our issues and try to fix them. Do you think separation will help our marriage?