After encountering "The Wife's Temptation", how should I face my husband in the future

I never expected that the plot of the recent popular Korean drama "The Wife's Temptation" would happen to me. I am only 27 years old, not at the point of being old and faded, and I've been married for only four years, not reaching the seven-year itch yet. I just can't figure out why men can't resist those flirtatious women. My husband is a middle-level leader in a company. We don't have so many complicated plots like what's shown in TV series.