I've got friends, of course, but my business has always been the same a one-man affair. That is why I have always Played a lone hand.

当然，我也有朋友，但是我的生意还是一个人的事情，那就为什么我一直扮演一个孤独者的角色。

youdao

My mom was really upset because he was accusing her of having an affair with another man.

我妈妈真的很难过，因为他指责她和另一个男人有暧昧关系。

《柯林斯英汉双解大词典》

After a few dates with a man she connected with, she began an ongoing affair.

在和一个男人约会几次之后，她真的有了外遇。

youdao

Do you regret, as a moral leader, that there hasn't been more discussion of the fact of a man having an affair with a married woman, and all of that, the moral side of that?

BBC: NEWS | Programmes | Breakfast with Frost | Hope on faith

Essentially, man finds out that his wife has been having a long running affair with the man she is secretary to.

FORBES: Harassment by Twitter and Blog

The three are accused of creating a fake trail of text messages with a "mystery man", implying Miss Wells-Burr was having an affair with an unidentified man who was responsible for her death.

BBC: Catherine Wells-Burr