My husband wants to have other women but i'm not ok with it. he said and listen to to yts men saying that it normal, would it be bad if I leave?

First I want to say that when I say husband, I'm not married, he doesn't believe in marriage. We have two children one is 22 and the other is 10, we got together as teenagers. He now has a girlfriend again, he has had many, I have always been unhappy about it and act crazy jealous. I know and want to leave, I told him I can't take it but he tells me that this is how it's been for many years and I/women need to get back to expect has they have, that might be true, but he is not hearing me. Is this something that I need to expect? It hurts a lot, I cry to sleep. I want to leave, I know if I leave it will hurt but it will end the rollercoaster and will be able to move on. Issue is as I will be starting soon I will leave the kids with him as it the best option.

My husband wants to have other women but i'm not ok with it. he said and listen to to yts men saying that it normal, would it be bad if I leave?
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