misery loves company idiom
saying不快乐的人喜欢向人诉苦
people who are unhappy like to share their troubles with others
We'd both just broken up with our boyfriends, so we decided to go see a movie together – misery loves company. 我们都刚刚和男朋友分手，于是决定一起去看电影——不开心的人需要找伴！