Why do I feel this way?

So me and my partner has just broken up. She told me to become her best friend I know that's not gonna work out for me. So I told her no and blocked everywhere. Right now I'm still trying to move on. But I still love her.. I don't know why. I tried not thinking about her but she's always in my mind. I need to move on but how
Why do I feel this way?
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