我不是鱼做不到七秒忘伤
[wŏ bù shì yú zuò bù dào qī miăo wàng shāng]
Fish have short-term memory problems, believed colloquially to have 7 seconds of memory. By this phrase, the user is saying that unlike fish, he/she finds it hard to forget or forgive past wrongdoings and moves on.