Why is it so hard to leave...

I haven't posted here before, new to this sub

I am married to what I along with many others believe is a narcissist (including his own mother) and I have a 5 and 7 year old

I tried leaving 3 weeks ago told him I wanted to separate and go down south as my entire support system and family are there and want me and the kids. They will help support financially for awhile, place to stay, help with the kids.

And yet I let him talk me into staying. I went to therapy for the first time today and was completely validated on every level, that has never happened before where I'm completely validated in me feelings.

With all of that, why can't I leave? Why do I feel so guilty? It's what I want and yet I'm so scared. He's never physically hurt me but the verbal abuse and narcissism are terrifying. He makes it all my fault and I believe him for some reason

Any success stories? Or others in the same boat trying to leave with kids? I did talk to an attorney as well and my narc is a severe alcoholic.