How do I keep my past from worrying me so much about my current relationship?

How do I keep my past from worrying me so much about my current relationship with my girlfriend we are in a long distance relationship and she tells me I have nouthing to worry about but my past still haunts me and the way I was treated in the past how can I let go of my past and stop worrying

How do I keep my past from worrying me so much about my current relationship?
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