How do I move on from a 7-year friendship I ruined after a 3-week relationship?

I dated this girl for 3 weeks and I feel that I've ruined it all for us cuz I hung up on her on video chat but I still love her. How to get over her?

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We were friends for 7 years and decided to date well that lasted 3 weeks
How do I move on from a 7-year friendship I ruined after a 3-week relationship?
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