Why would a wife ignore her husband’s 7-year affair instead of confronting him?

she's in her 50s, sahm, 2 kids in college. She knows he's been cheating both physically and emotionally with the same person for years. She gets angry at his mistress and threatens but never confronts him. Same with kids. She would be OK in a divorce just not as much luxury.

Why would a wife ignore her husband’s 7-year affair instead of confronting him?
Post Opinion