"I'm not saying you're not a catch, Lily. I'm just saying if you're a catch, what's wrong with you? Why are you still single?"

This quote by Barney Stinson indicates that Lily is a preferable person, however he is questioning why she is still single. He is recommending that there must be something incorrect with her if she is still single, despite being a "catch". This could be interpreted as Barney being important of Lily, or it might be viewed as him being curious regarding why she is still single. It could likewise be seen as Barney being helpful of Lily, as he is indicating that she is a desirable person. Eventually, the interpretation of this quote depends on the context in which it is said and the relationship in between Barney and Lily.