To be fair, unless one of the parties is out of the loop, it takes two to tango. If someone knows the other individual is taken, then that's tacky. If they don't? All on the cheater.

Like, I think blame is more evenly split with the Kristen Stewart situation because they were both in relationships. I don't think Alicia was, though, so while she's at fault it ain't as bad? Correct me if I'm wrong.