affair · noun /əˈfer/
affair (SITUATION)
B2 C a situation, matter, or set of related events that is being dealt with or considered
Dictionary examples:
The meeting was addressed by an expert in South American affairs.
What I do in my spare time is my own affair.
Learner example:
To make matters worse, people gossiped about me and tried to find out more and more about my private affairs, which made me feel embarrassed. (First Certificate in English; B2; Spanish)
affair (RELATIONSHIP)
B2 C a sexual relationship, especially a secret one
Dictionary examples:
Do you think he's having an affair with someone?
The book is the story of a long love affair that has a sad ending.
Learner example:
I am that kind of indivi[dua]l that loves stories, they can be either love affairs or fantastic adventures but I really enjoy getting involved in some kind of story. (First Certificate in English; B2; Catalan)