Why can't I get over her?

I was with a girl for seven years and she ended the relationship two years ago. I've done everything to move on since then; hobbies, the gym, a new relationship, even cutting off contact with her. But I still can't stop thinking about her. I obsess over her every day even though I know I can't go back. I love my new girlfriend but this lingering feeling won't go away. Why can't I forget my ex? Is this normal?

Why can't I get over her?
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