Can we use 'affair' only with heartbroken sentence?

[Salman]

Synonyms Lesson, Advanced Level

ESL/EFL Test #122 "Synonyms for business and employment", question 2

Marylyn was heartbroken when she found out that her husband had been having an ......... with his secretary for a long time.

(a) occupation
(b) involvement
(c) affair
(d) engagement

Synonyms Lesson, Advanced Level

ESL/EFL Test #122 "Synonyms for business and employment", answer 2

Marylyn was heartbroken when she found out that her husband had been having an affair with his secretary for a long time.

Correct answer: (c) affair

Your answer was: correct
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Can we use 'affair' only with heartbroken sentence?

Salman

[Conchita]

The term 'affair' can be used in different contexts. It can have the sense of 'business': this affair is keeping him occupied; that's my affair (it's my business and not yours); her affairs seem very complicated (her business deals seem very complicated).

In the test sentence, it has the meaning of 'love affair' (often a secret relationship).