不曾落泪不曾心碎
[bù céng luò lèi bù céng xīn suì]
The meaning here is 'I've never shed tears nor has my heart been broken'. By adopting such a username, the person could be conveying resilience and fortitude, having possibly faced adversity but remained emotionally stable; it could also denote a past of limited emotional attachment or difficulty in expressing feelings.