Closet Downsizing: how do you deal with seller's remorse?

[ReallyConvolutedCareerHistory]

I have recently sold a bag and I am having seller's remorse. How do you make yourself feel better after selling?

When I get rid of something, I think 'out with the old and in with the new'.

Happened to me and I bought the same bag (in better condition) on Ebay a few years later