Miscarriage and break up

I miscarried around 5 weeks at the end of October. The pregnancy was not planned and my boyfriend and I have always had a very up and down relationship. In fact, we weren’t speaking when I found out I was pregnant. I told him and we came together and we were doing very well and then a week later I miscarried. We were both devastated and tried getting through it until we broke up recently. Let me say, I know this break up is the right thing as he is very difficult to deal with - He’s a liar and manipulative. Leaving was my choice it’s just hard going through losing a baby and losing a relationship completely. Just want some reassurance because it’s taking every ounce of my being to not contact him and get back into the toxic relationship. I’m just feeling lost and alone. :(