How can I get over my girlfriend's past without ruining our relationship?

I've been dating my girlfriend for 7 months and I can't stop obsessing over her past relationships and flings. It eats at me and even though I know it's not fair to her, it affects how I feel about us. Has anyone else dealt with this? How do you forget about it and focus on the present?

How can I get over my girlfriend's past without ruining our relationship?
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