Long story short (or as short as possible) broke up with ex (father to DC) beginning of last year. Lots of issues surrounding contact ie. him not turning up, not seeing them for weeks on end. We now have a court order in place. During our relationship there was many a times he’d threaten to kill himself, he was going to go jump off a bridge etc. Once actually grabbing a knife and standing with it against his throat. Even after we’d separated, he was stalking my social media, texting me informing me of who’d liked something etc. So I blocked him, and he went on some sort of tirade.. he wasn’t seeing the kids anymore because I’m so and so and he was going to harm himself. Recently he’d assumed I was seeing someone from work, and informed me we would have serious issues if this was the case, things would change dramatically, etc. I made it clear that it wasn’t any of his business either way and that his concern should be the DC, not what I’m doing. He then started to insist on walking me to work after handover with DC (even when I’ve said no repeatedly), would conveniently walk the long way around after dropping DC at nursery and bump in to me walking to work (he says he fancied walking a different way), would appear in the shops and follow me around (obviously when one of us has DC it’s difficult to ignore him). He’s now started to turn up at my place of work and one on occasion verbally abused the person he assumes me to be seeing, then came to tell me he’d done it! He’s sent threatening text messages and attempted to start arguments in the middle of shops with me (on one occasion my mum was present which led to her phoning the police). Now I’ve given a statement to the police and they’ve seen messages, they’ve arrested him for harassment and stalking. I feel guilty for some reason, I’ve always tried my best to do the right thing in terms of the children and making sure they have a good relationship with their father, even making sure he was okay during lockdown in terms of mental health etc. but he’s effecting my life so much at the moment, I’ve been on edge when I’m at work wondering if he was going to turn up, and it seems he’s doing everything in his power to make my life difficult. I’m concerned for the effect this may have on our DC because of the lack of relationship me and their father will have. I don’t care if people tell me I’ve done the wrong thing either, just I would appreciate some outside opinions!
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You have 100% done the right thing. Well done you, that’s v v brave. 
Well done to your mother for calling the police and well done you for making a statement.
What a horror.
Do not trust him an inch.
@Ineedicedcoffee
I think, because of his previous mental health issues and his threats about suicide, as well as his escalating stalking, I'd be asking for supervised contact only with DC's.
This kind of 'reasoning' where he needs to be able to 'contact' you whenever HE wants to, will only feed his 'instability'.
i.e He'll always 'engineer' things so that he can contact you, because you'll be 'afraid' for your DC's.
It will end up being worse for you DC's, not better, because he'll have something to gain by 'not coping' 
It's yet another tactic he's using to have some control over you, and the only way to stop him is to arrange for 'supervised contact', so that if he ''feels he's not coping'', there are people there to support him.
It will also mean that you can be sure that your DC's are safe when he sees them.
Any hint of threats of suicide need to be past to the police for a welfare check.
He is NOT your responsibility.
If he tries to blackmail you with threats of self harm, tell him you will pass any on to the police to deal with.
This waster is not your responsibility.
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