A woman takes a cheating husband back at the end, mostly because she's decided that she's on a higher moral level where she can forgive him, and he was just a silly man who couldn't help but chase a bit of skirt, bless him.
Ruined books for me lately (I won't name the books themselves to save the spoilers) for books by Marian Keyes, Liane Moriarty and Lisa Jewell. Otherwise fantastic authors!