The only feeling I get is that Gillian is way more comfortable with social media than David and this has nothing to do with who is more into whom. Twitter doesn’t reflect the status of their relationship. This Gillian / Brick banter isn’t meant to prove anything. As much as I wished David would have stepped in, it would have been for our own enjoyment. If they want to flirt, show their love for each other and how into each other they are, they have many other ways to do it than using Twitter.