Not been together since Christmas, he has severe mental health issues, and is delusional and paranoid to a huge extent. He believes I've slept with/ am sleeping with all his friends. He's beat up a ton of people because of it. He believes our daughter isn't his: he had a DNA test proving she was, he truly believes I've tampered with the test somehow and so is having another one done. I tried to get him sectioned on the advice of MN, they couldn't care less.
He harasses me, sending me texts calling me every name under the sun, up to 20 texts in a night sometimes, he spreads rumours about me. I have severe anxiety now, because of him. I've been so depressed, and failing at uni - but I've got a new job, and things are really looking up. I'm feeling happy for the first time in a long time.
He is allowed supervised contact with DD, although she's not on a list or anything - SS believe I'm able to manage it myself. When he brought her back today, he barged in my house and asked if he could stay on the sofa. I said no, I wouldn't be comfortable with that and he squared up to me in front of our daughter and said he would strangle me if she wasn't there. He has never threatened violence before. I asked him to leave.
He refused, so I called 101. He said if I hung up the phone, he might think about leaving - smirking his head off like it's a given I'll do what he says. I knew if I did, he'd think he could do anything to me and I'd allow it. So they came round. Said there's not much they can do but they'll go and warn him.
I'm very glad I called the police as I feel so guilty my DD had to see that - they're not the sorts of memories she should have, she's so innocent and precious 
BUT:
My tenancys up for renewal and his mum and dad are my guarantors. I have nobody else to be my guarantors. I couldn't rent in this area without one. I could move up north, but I have a year left of uni and I'd have to leave my support system here. And I love my house  he's obviously saying I can kiss goodbye to that now.
He's a patient at my new work. In there a lot due to said MH. He knows this is the worst place he could kick off and I would just be mortified.
I know SS will call tomorrow. He has just messaged me saying he's going to tell them all about my drink and drug problem
I go out about 3 times a year. Definitely don't have a drug problem. Have a glass of wine or two in front of the TV a few times a week, that's it. But what if they believe him?!
I feel like everything, my baby, my lovely home, my great new job, my uni course; it's all at risk now. Everything I've worked so hard for since I was homeless and pregnant with nothing at 21. I rung the police because I wasn't going to start arguing to get him to leave in front of my daughter, I wanted to protect her. But now I've just fucked up both our lives? Everything's such a mess.