她发现男友是个脚踏两条船的人，因为他周末总是找借口不回家。

She realized her boyfriend was a ___two-timer when he kept making excuses to stay out on weekends.

她发现男友是个脚踏两条船的骗子后立即分手了。

She broke up immediately after finding out her boyfriend was a ___two-timer.