We all saw that Nnenna was being told she was too reserved, quiet, and boring. Personally I can't judge based on everything I see on TV because they have the power to control the audience by only showing us what they want us to think. Jay might have directed that last kiss and we never see it. The male model might have been gay and everyone knew it but the audience and it was an understanding between them that they photoshoot was going to go there. We didn't see the entire conversation with Nnenna and her boyfriend so we definitely are limited on facts. However everyone is still entitled to their own opinion.
A couple of years ago I read that a Nigerian woman was been stoned to death for cheating on her husband. I don't think or know if Nnenna is from the same tribe but I really don't think she will deliberately cheat on her boyfriend on National TV especially for a girl like her who grew up in a country where some tribe stones their women to death for infedelity.