This is the same guy you posted about before - he'd been charm personified and you had a lot of fun until you realised he was on probation for assault (or similar), you thought you'd ended it on the phone, then he came round that night, you then ended it again the following day and, as I recall, he kept texting you for a few days until he sent a message saying he was ending things with you - at which point you heaved a sigh of relief and haven't posted since.
Is my account accurate? If so, I had my doubts that someone with his temperamant would go quite so quietly - and it seems he hasn't.
It appears that you've become a convenient outlet for him to vent his aggression and I suspect that, if he didn't have you to threaten/terrify, he'd have been involved in another violent physical encounter by now.
In short, he texts you anytime he needs to big himself up. He likes to, and needs to, feel that women in awe of him - after all, he is all-powerful and he always calls the shots, doesn't he? No-one messes him around (in his mind, that is).
Please don't feel that you have to play by his rules - because YOU DON'T. Nor do you have to creep around your own home terrified of whether he's going to be knocking on the door, or of what he might do.
If his stuff hasn't gone from the gatepost or you've put it back inside your house for safekeeping - which is by far the best idea because there's nothing stop him collecting it and subsequently claiming that it wasn't where you said it would be - simply text him tomorrow to the effect that you'll post his stuff to him on Monday and if he comes anywhere near your home you'll be calling the police.
Speak to your line manager on Monday and tell him/her that you are receiving the unwelcome attentions of a man that you had a close (but not sexual) friendship with for a couple of months until you became aware that he was not all he seemed to be, namely, that he has a reputation for aggressive behaviour which has lead him to acquire a criminal record.
Say also, that since ending the relationship, he seems unable to accept that you have no interest in him and his texts have become increasingly menancing/threatening to the point where you are now considering involving the police.
He'll move on from you once he's found another woman to charm and then abuse but, rather than waiting for that to happen, you're best advised to be proactive now and, assisted by the police if needs be, put an end to his 'reign of terror'.