Am I best to bring my twins up single?

Long post 

A month later I found out I was pregnant non of us used protection I guess we was both to blame although he has always said it was my fault I fell pregnant, when I found out I was pregnant I wasn't sure wether to carry on with the pregnancy I went for an early scan to see how far along I was it was then I was told I was carrying twins I knew at that moment I could never abort my babies they where to precious to me (I went through an abortion at the age of 16 not my choice and I knew how hard it was and how I couldn't go through that again) when I met the father he was still sort of involved with his ex partner although he told me and everybody at work that they wasn't together and haven't been for months she was just a stalker that would turn up at work, he came to my 12 week scan and seemed to be really excited about becoming a daddy, there was domestic violence between him and his ex partner which resulted in her getting a restraining order from the police against him although this didn't stop them from seeing each other, she also pressed charges against him he now has a police record for domestic violence and has weekly probation meetings, sometimes I knew they had seen each other other times I hadn't, she burnt scan pictures of my twins which she as a mother I think is disgusting, social services where involved because of there domestic violence and her children placed on child protection, he told probation he was staying with me and me and my children aged 6&5 different dad have now been put under social care but not child protection, he moved away and came back nye but 2 days later went to see her, he told me about this the day later but while drunk and he kicked of at me and put his hands round my neck twice, he's now worried I'll tell social and he'll get in trouble with the police, I know he has no respect for me and doesn't love me although he's told me a few times he does, he's been very horrible in things he has said to me, I've spent hundreds of pounds on him to which he has now said well if I can get something out of you I will, I feel so stupid but I also feel guilty on my children, he's walked away this morning and said he's done with me, shouldn't this be the other way round? It's like he's walked away with no  consideration for his unborn twins, I'm 36 weeks pregnant now and will be having a section in just over 2 weeks time as both twins are breech, I guess what I'm trying to say is will I be okay on my own? Should I feel guilty that they won't have there dad in there life? Will he ever change? Will he be more violent towards me in the future? I'm so confused and full of emotions and hormones, thanks for taking the time to read this x