put/lay your cards on the table idiom
摊牌，（把想法和意图）和盘托出
to be honest about your feelings and intentions
I thought it was time I laid my cards on the table, so I told him that I had no intention of marrying him. 我觉得到摊牌的时候了，于是就告诉了他我并不打算嫁给他。