It Was My Lover's Temptation, I Dried Up My Loneliness

I married an autistic genius who was 13 years younger than me. I never imagined that the “other woman” would be my mother-in-law’s adopted daughter... “His love for me was like the purple Wednesdays in his eyes.” That is, until the young female university student hired as the family’s nanny appeared. The childhood sweetheart had only been late in coming back into his life. At 36, should I step aside?