According to WebMD, the “in love” stage of an affair lasts 6 to 18 months, on average. And around 75% of the marriages that start as affairs end in divorce. Considering only 5 to 7% of affair relationships lead to marriage, thats a grim statistic for couples hoping their affairs will last forever.

Can an affair turn into a healthy relationship?

there is no circumstance under which an affair can lead to a healthy relationship.