What to do, advice please?

My ex moved out in June, it was a horrible break up. We were together about a year and I proposed to her, she said yes. Long story short about a year after things went south. After she moved out we never talked again. I was just going through a drawer I rarely use looking for something and I found an envelope with the ring inside. Now it's got my mind messed up. I don't know what I should do, especially with the ring.
What to do, advice please?
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