i miss my ex best friend

i dont know why even though she left me when i was at my lowest, betrayed me and replaced me i dont understand why i still love her alot and i cant bare to delete all the pictures we once shared and took. Everytime I pass by her house or places where we used to hang out, I lowky feel like crying all over again. Its been like 2 months since we broke off and i really miss her. It her birthday this month and I really wished that nothing came between us and i could be with her on that special day.