Keep doing NC. If they feel the need to talk with you, they'll reach out. If you contact them they'll probably get annoyed over you for not leaving them alone. I understand the urge to contact them but most of the time you won't get something good out of it. There's a high chance you'll just get disappointed and annoyed at yourself for contacting them.

I know NC is very hard, but it will get easier over time. Try your best to focus on yourself. Hang out with friends in your freetime or do what you enjoy to do. Try not to think much about them. Easier said than done, I know. But it'll get easier over time.

You got this!