I have an affair with my secretary.

我和我的秘书有暧昧关系。

youdao

Mrs. Culpepper was almost in tears. "Oh Marie, " she said to her maid, "I have reason to suspect that my husband is having an affair with his secretary."

库尔佩伯太太几乎要哭了，她对女佣人说：“玛丽，我有理由怀疑我的丈夫跟他的秘书有一腿。”

youdao

"Come here, child," cried her father as she appeared. "I have sent for you on an affair of importance."

爸爸一见她来，便大声说：“上这儿来，孩子，我叫你来谈一件要紧的事。”

youdao

"I have made my drawings with the greatest accuracy, and the most minute attention", he wrote."In an affair of so much consequence to the dignity of the United States,"

VOA: special.2010.01.27

She and I were very close and she would have told me if she was having an affair with him.

BBC: NEWS | UK | Wales | 'Inaction partly led to pub killing'

If I had, I would probably have thought that such attentions were part of what it meant to have an affair with an older man.

NEWYORKER: Hand on the Shoulder