I would say, yes, for the most part. I'm pretty relaxed finally - most of the time. But we live in different countries and they have no idea where I even live. I have tried to be quite careful about my online presence and making sure it doesn't give away too much personal information, so they can't easily find me.
I do get a bit anxious around Christmas/birthdays as that's when they tend to pop up. I did go through an initial period of reminding them that I wanted no relationship with them and never to contact me again. Now I just don't respond and I can read the message if I want to from the notification screen on my phone, so it leaves it unread on their end.
I did get a notification yesterday that that they liked an old photo I sent them years ago on Facebook messenger, so they are obviously going through old messages and this usually happens when they decide to pop up with some passive aggressive message. So that puts me on edge a bit.
But because we are fortunate to have the physical distance between us and they can no longer send anything physically to my house as don't know my address, I'm confident that I can cope with messages online (I refuse to block them because they would love to tell their friends what a terrible person I am for blocking them). I've gotten very good at grey rocking it and moving on from messages, so it's a lot easier now.
In your case though, I have to say, I'd need to move far away before I could feel truly at ease, I think. It was definitely a relief to move and know they didn't even know my address anymore.