我薄情冷血你功不可没
[wŏ bó qíng lĕng xuè nĭ gōng bù kĕ méi]
The meaning here is 'You played an important role in making me heartless.' This suggests the user has gone through emotional hardening due to certain people, likely referring to difficult or hurtful past experiences which made them become emotionally cold or unfeeling.