How common are feelings of nostalgia for past relationships?

I found myself reminiscing tonight, when I had a moment alone, about some of the men with whom I’d previously been in love, as a young woman. One in particular, an Irish Catholic, with whom I lost touch forever after we had an explosive argument. I felt a few seconds of mild regret and sadness, fondness of the memories of the good times we’d shared; then back to the here and now.

How common are feelings of nostalgia for past relationships?
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