Does the word "affair" in Haitian Creole command the same expression as in English?

For the most part, yes.

Haitian Creole word for 'affair' is 'zafè'
As in English it stands for personal business, business matters, personal concern, an engagement or an organized function. It could mean romantic or sexual relationship, but it does not imply extramarital relation.
example:

Yo fè zafè. - They're involved (romantically)

Sa se zafè pèsonèl mwen. - That's my personal business.

Zafè m pa bon. - Things are not going well for me.

Maryaj la te yon gwo zafè. - The wedding was grandiose.

Ask me anything