 In season one episode 18, Dixon reveals that his birth mom has bipolar when he sees the same symptoms with his then girlfriend Silver.Later on, in episode 19, Dixon and Annie road trip to see Dana.Dixon felt bad because he said he wanted to leave her when he was a child and had extreme guilt because of it and felt like it was his fault; but when Annie was talking to her, Dana reveals it was not Dixon's decision and it was for the best.