Why do I feel this way about my ex?

So i broke up with my ex about 2 months ago. It ended terribly. I was heartbroken. Yet I feel like if he came back for me I would jump back in even tho I know it would be so wrong. He put me through so much and we went through a lot together. I feel as tho this is affecting me by preventing new relationships.
Why do I feel this way about my ex?
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