I'm so relieved to read your update @nataliehere. You are being very strong in a traumatic time.
If he threatens you at all call the police. Do you have a security chain on your door? In fact I wouldn't even open the door. If he turns up, and it is likely that he will, tell him to leave. You don't want to talk to him, he must leave. If he does not leave call the police.
If things go quiet and he doesn't turn up then watch out for him being outside your home or work. I don't mean to frighten you but be alert because he sounds all sorts of batshit.
I suggest you get one of these too. Or whatever design suits you best. I found the wrist one really gave me peace of mind when I felt anxious as I knew I only had to press it against something to set it off. A lot easier than fumbling around in a pocket or one of those dangling on a neck or wrist strap.
Wrist Worn Panic Alarm
He will follow the exact same script as the 30+ messages. Everything from declaring undying love to accusing you of having another man. He will probably call you every name under the sun while doing it. Don't believe a word he says.
He is a dementor and he wants to suck the very heart and soul out of you. Credit to JK Rowling of course.
Dementors are among the foulest creatures that walk this earth. They infest the darkest, filthiest places, they glory in decay and despair, they drain peace, hope, and happiness out of the air around them... Get too near a Dementor and every good feeling, every happy memory will be sucked out of you. If it can, the Dementor will feed on you long enough to reduce you to something like itself... soulless and evil. You will be left with nothing but the worst experiences of your life.
Stay strong and good luck.