idiom · an irresistible but ruinous attraction or obsession, often leading to one's downfall

她对这段感情的投入就像飞蛾扑火，虽然壮烈却注定失败。

idiom · to court disaster or seek one's own doom like a moth flying into a flame

明知那是陷阱还要往里跳，他这样做无异于飞蛾扑火。