[Jack_]

He was cheered cause he's an attractive male and the crowd are scummy morons.

Having said that, in situations like these the person who is cheating takes all of the blame...he has at least tried to distance himself from her. He isn't the one in a relationship, it's not his problem. And I would be saying the same if it were the other way round...unfortunately the crowd wouldn't, and would no doubt still cheer the man but boo the woman.