Oh, well, that's all right, then, and you must go to tea with Cynthia another day. I told him about the letter. 
I didn't mention the letter because I didn't want to upset him.
mnli hypothesis: I didn't mention the letter because I didn't want to upset him. premise: Oh, well, that's all right, then, and you must go to tea with Cynthia another day. I told him about the letter. 