If you were Wilson's mom, would you have want to knew?

If I were his mom I would feel so betrayed after hearing that he had an affair and the result was the girl killing herself. I thought that was why she was crying at the end but I was told by my cousin that she somehow felt remorse for killing the guy Javier but I thought the latter may not make much sense. So no I wouldn't want to know I'd still want to remember him as the man I loved and thought he was but that's just me.

I think she did know. Earlier in the movie right before one of the shootouts, she says "Its not about the money" and then at the end she asks Wilson what was his reason. Wilson says it was for the money" and she gives him this look as if she decides to play along with that reason. Then they have this silent moment. Its like they both agreed to pretend that they didn't know the truth and it was just for the money.
Watch the movie again and you will see what I am talking about.

You could just tell partly because she said its wasn't about the money. Also towards the end, she was staring at the large painting of Mora. Women's intuition.