Single parent since my DTs were babies and I left their father who after 6 happy childless years took it upon himself to become abusive once I was pregnant. I put up with it during pregnancy because there was no physical abuse at that point and because I didn't want to be the parent of children from "a broken home" (stupid phrase - it was broken when we were together and leaving was the first step towards fixing it).
I have never looked back. The worst thing about it was financially struggling in the first few years, because childcare bills were crippling. I went back to work 6 weeks post partum and was back full time by 3 months.
I'm not going to underplay the financial hardship side of things. That was seriously hard. But I'd go through it again, any time, if the alternative was remaining in a relationship that left me feeling like I could no longer trust my own judgment, that my needs came, where everything was my responsibility, where I no longer liked and recognised the person I'd become in a bid to 'keep the peace' in the relationship, where I worried about the example we were setting and atmosphere we were creating to raise our DC in - in short, a relationship in which I sold myself short - and by extension my DC (who were very much more my responsibility).
The day I left - with literally the clothes on my back and two newborn babies - I felt freer, prouder and happier (if terrified) than I had done in a long time. After a couple of hard years financially, during which I did a lot of soul searching about myself and my relationships, I emerged much stronger and far more confident than I'd ever have believed possible, and TBH it has set me on to bigger and better things than I'd have ever dreamt of had I still been in that relationship.