Exactly what everyone else is saying. 8yrs for DV is very very serious!
Absolutely no chance that he has changed, or that the dynamic between you wouldn't go back to the way which caused you to need the restraining order in the first place. There will be existing patterns in the dynamic between you, and it won't go well.
In fact, I would be very scared and contact the police as him being in breach of the restraining order means that you're still on his mind.
Whether that's because he still wants the control/source of supply he had with you - that must be pretty intoxicating to someone like him - or because he's playing nice in order to get close enough to get revenge I wouldn't know, but I do not think there's any healthy reason he would get in touch.
Think it through:
- healthy thoughts: I really fucked her over, I should stay out of her life and let her heal. I should focus on my own personal growth and issues before even considering being in a relationship again, and that's years away since I've just been in prison and rehab/therapy opportunities there are limited.
- also in his own self interest - breach of restraining order would see him sent back to prison, so for his own protection if he had healthy motives, he'd stay away.
- if there are children, healthy would be attending supervised contact to prove he can be safe
-unhealthy thoughts: revenge, desire to be in control, anger at being in prison, "she deserves it", I can't be alone, she's "mine" so I must have control of her, I'm so obsessed and fixated that I risk prison to contact her. Also possibly lack of money/job as prison record, so wants you to feed and house him. And if that's true then frustration also more likely to lead to anger and violence down the line.
There is no healthy reason for him to contact you.
Contact the police to let them know he has, move house etc if possible so he doesn't know where you are, and then look at therapy for yourself to address the trauma bond you still have with him.
I'm so sorry for you, but really, never never never go back, don't get in contact, don't open the metaphorical door to him even a crack, it's so dangerous for you.