How did he get that second message to you after the work phone one? Was it the work phone again (if so, block it now) or has he used yet another number?
The messages you’ve shared this morning are chilling. He’s getting more and more unhinged and desperate because he’s beginning to realise you aren’t caving this time. When it hits him that you are serious, this is over and you won’t respond he will turn aggressive. This isn’t an “if” or “maybe” it’s a “when” and “he will” situation.
I posted on here making some safety suggestions yesterday. I would add to it about the video doorbell. Yesterday’s suggestions were ones you could implement immediately.
When he turned up at your house yesterday, do you have any reason to think he would legitimately have been just around the corner when you messaged? Or is it possible he was already stalking/watching you before this?
You seem hesitant to involve the police, but you need to think about your kids. You don’t want them coming home to find your dead body when he escalates. I’m not saying that to be nasty, I’m saying it to remind you of what’s on the line here - your life. Have you seen the tv series “You”? Or series like “Criminal Minds”? It’s depicted on tv a lot how stalkers turn into killers - if they can’t have you no-one can type of mentality. They aren’t rational. If they were, they wouldn’t be stalking their victim,
He’s initially told you he understands you need space and that he’ll give it to you. Then he text you from a different number. And then he’s messaged again. This man doesn’t care what you want.
Please, please call the police. They won’t think you are wasting their time - and maybe a chat from them will stop him… or maybe he will continue and you’ll have to call them again and he’ll be arrested. But you need to get this logged with them so when he escalates, your call isn’t the first report which might involve letting him go with a caution.
Look after yourself. Screenshot everything he sends, make notes of the numbers, if he turns up try to record it. Have exit routes planned for your house. Have friends you can call for help ready. If your brother can come and stay for a few days he should, even if that means you don’t get your peace and quiet. If you can find someone to look after yourself cat, get away for a few days. Definitely leave a video doorbell recording activity though!