我太好骗小三才会乘虚而入
[wŏ tài hăo piàn xiăo sān cái huì chéng xū ér rù]
This name suggests a feeling of regret or helplessness. It implies the person believes they were too gullible or trusting, which allowed someone (metaphorically referred to as 'the third party' in Chinese) to take advantage of their relationship.