Is it better to have loved and lost?

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Are those people who have lost their love once better lovers? Do the value their loved one more than someone who hasn't lost his love? Or does losing his lover breaks a person so much that he is never able to love anyone else again? Today I came across a girl I had talked to two years ago. At that time she was very jovial and used to express her feelings freely. But today when I talked to her, she was full of negativity. She wouldn't smile at any of my jokes. She was so depressed. I asked her and she told me that she doesn't feel like earlier times as the guy she loved had ditched her for another more beautiful girl. I felt sad for her. My personal experience is that when my girlfriend ditched me, I became more expressive. That experience actually helped me improve and now I feel that I am a much better person. I would even thank her for ditching me if I met her again although at that time it was extremely painful. What do you people think, is it better to have loved and lost?