Casey didn't even know what love was supposed to be like. How could he ever think of being in a normal relationship? All of this had happened largely by accident.
Baby steps into the water led to getting in too deep. Now he was stuck. A good kind of stuck though, despite his panic about what came next. His cocktail of emotions was rather conflicting.
Being with Vera made him happy but he was also paralyzed with fear about the prospect of loving her. Kane was wrong. He didn't love her. He thought she was amazing and wanted her to always be happy but that wasn't love. Not the love he was familiar with anyway.
Casey couldn't love her. It was too dangerous.
Honestly, Vera would be better off without him. He still didn't understand why she had chosen him. Convenience? Desperation? Loneliness?