Why is Eunice mad at her husband, Steve?

Eunice is angry at Steve because she believes he's been messing around with a blonde. In Scene Five, she is confronting her husband about it.

EUNICE:
I heard about you and that blonde!
STEVE:
That's a damn lie!
EUNICE:
You ain't pulling the wool over my eyes! I wouldn't mind if you'd stay down at the Four Deuces, but you always going up.
STEVE:
Who ever seen me up?
EUNICE:
I seen you chasing her 'round the balcony--I'm gonna call the vice squad!