estuvo acostando
Preterite progressiveél/ella/ustedconjugation ofacostar.

acostar

Entonces, tomaste la responsabilidad tú mismo de regalar 622 mil dólares, de mi dinero a un hombre que se estuvo acostando con mi esposa.
So you took it upon yourself to give away $622,000 of my money to a man who had been sleeping with my wife.
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to drizzle