There is absolutely nothing wrong with remembering what the ring means, just don't dwell on it beating yourself up because of the situation you're in.
Jar is right. It doesn't sound like you're ready to go without the ring. However, if you feel that its symbolism is a barrier to you moving forward, then consider carrying it in your pocket or just go cold-turkey.
As for Denver, I hope that you really will look for someone else to go and, if you don't find someone, it's no big deal. Don't ask her again though - she knows you want her to go. Find someone to take her place or go alone. Either way this will help with your healing.
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07