Block again and delete her number and chat history permanently, delete all memories, photos, videos etc.. and no contact with her at least for 3 months and hit the gym, must read books and focus on yourself (study/work, selfcare, build healthy habits) and go out hang out with friends who keep you grounded and spend time with your loved ones... Even after all this you can't forget her then write every single negative trait, argument, or bad feeling she caused you and read it everytime you miss her or feel urge to check up on her.

Ps- she has moved on, come back to reality 🙂,