I don't know if this is in the right forum or not, so if it's wrong, please feel free to move it.

Here's the story. A couple of months ago I found out my brother had been cheating on his wife. I'm not sure how to feel about this. The thing is, my brother's wife is pretty lazy. She doesn't work, she doesn't study, she doesn't cook, clean, feed the dogs, wash clothes...nothing. My brother goes to work, comes home, and has to do all of the above. I'm angry at him for not voicing that he was unhappy and cheating on her, but I'm also angry at her for putting him in the position where he had to turn to another person for comfort.

I don't know what I'm asking for here, but I don't know how to feel about this whole situation. Any advice/thoughts?