From my head on nicknames for boyfriends
Ask about her, what she likes or dislikes, her childhood memories, her fears, her passion, her embarrassing experiences of life etc. Always be attentive when she talks, and ask random questions every now and then. However, never give your fixed opinion about any past experience. First try to understand her, and then ask relative questions to support her feelings. It is also good to ask her about yourself and how she looks you in her life.