burn one's fingers

英语对话A: You see, I don’t want to get my fingers burnt by asking you to get on with Mark. But one thing I must let you know is that he’s a good catch.B: I don’t know. But I have got my fingers burnt by helping Mark. He was thankless.A: I don’t know why you have such a bad feeling about him.B: I don’t have bad feeling about anyone. But he did hurt me.