I left promising to share custody and we have been sharing about 60/40 informally for 3 months now with no legal arrangement. It was hard to leave. The way I did it is I said I’m leaving on Friday, I’m going to my friend’s house. I will bring you our daughter on Saturday for a visit. And on Monday and we’ll just work the rest out. Again, really hard, but we’ve been doing ok and I had to go.
I tell everyone most lawyers will do a free consultation for divorce/custody so make an appointment to understand your options. Are you married? If not, is there established custody? Do you own or rent? Those things change what you can or should do.
I’ve known people to pack and leave while hubs is at work. As far as custody I don’t know how that works and I’m sure it depends on what state you’re in.