Changing the locks created a sanctuary, safe place for me and was wholly appropriate.
Next time she goes off on you do the "Uh huh", "Yeah", "I can see how you'd feel that way." Of course, I'm still not that good when I get intimidated, fell at fault when talking to the former spouse. But heck, I just keep trying.
It's great to hear what a wonderful weekend you had with the kids. You're the dad.