From the get-go, you've shared an easy understanding and a communicative rapport. It's not that you have such similar personalities that you never experience misunderstandings or disagreements -- of course, you do. It's just easier than usual, especially for your lover, to hash it out and express themselves without hurting your feelings.
This is because you have an instinctive understanding for just how to get through to them, and how to respect their individuality. In fact, your lover may feel a sense of power and vitality, as if their individuality is better defined than ever before. This is because they feel respected by you as a unique person with original, valid ideas and perspectives. They might even change and grow during this relationship, and truly become more of an individual than ever before, as this might be the first time they've experienced such respect, support and acceptance. Either way, they are very talkative with you, and love discussing their past experiences and relationships, their present activities and their goals for the future, and hearing all about yours. You could both even enjoy getting into the occasional, fun debate, since neither of you is threatened by the other's opinions! You also have great potential to be highly creative together; whether this takes the form of some really fun, unique dates or actually launching a creative or entrepreneurial project together is up to you!