I don't know if it's fake or they're both very insecure..

If you're referencing the conversation they had in the bathroom then I don't think it's fake, watching their relationship on TV I feel like it's more of a result of two extremely insecure people in a relationship together and they don't know how to deal with their insecurities, Stevie doesn't feel good enough for Chloe because he thinks he's an ugly duckling and Chloe is just a nervous and emotional wreck, I think it's real, but not a very good relationship at all.