I am seriously doubting some people know much about "teh mysteries" of women. Despite the fact, Caroline's route should teach people, women don't tend to say what they mean. Or did you buy her bs about how shes not interested in the MC too ?
The point is, people can say anything they want, and make other people believe what they say, but its only when they must put word into action do you see the truth. That was a lot of emotion to finally show when suddenly reality set in, and she decided at that moment, she wants to finally save her marriage.
Definatly not saying shes in love with Bob still, but there are still some feeling there, it says alot she didnt look back at the MC once or say a word to him.
I know people get invested in stuff, and hence why NTR gets people crazy (and this is touching on that), so it does make sense some people might not be willing to ever consider Linda is not being completely honest, and that her feelings for the MC is 100% True love, and Bob is garbage that is not worth any consideration, but the writing doesnt support that.