I agree block/ignore/total silence.
But you also need to actively do something to keep the will to do this and allow you to move on.
You have identified that you need to finish it. Now drill down and identify and name and keep repeating all those reasons. Decide that you deserve to be treated with respect and what firm boundaries you need to start implementing for your future.
This needs implementing be a daily reinforcement - you may find therapy, life coaching, ChatGPT, journaling, books, reading online and wise friends are all a help.
Its like getting fit - you just have to keep doing the things that you know is good for you, over and over and over, day in and day out - you can’t afford to ever let up.
I haven’t blocked my ex, but I never ever ever read or acknowledge his texts/emails. . It’s total radio silence on my end.
look up trauma bonding and other similar things. Sooner or later you will have a moment of recognition - and will understand why you keep going back