You two might have an intense sexual connection, but it isn't rooted in a healthy feeling of compatibility and togetherness. In fact, it's probably just another forum in your relationship in which to act out an old power play that existed between you in a past life. You two were involved, long ago and in another lifetime, and it wasn't a happy experience for either of you.
This person dominated you, ruthlessly and relentlessly, and they'll cause you the same grief again if they're not conscious of how they treat you in this relationship. You both might think that they're treating you just fine, when really they're dominating you emotionally on a subtle level. When you talk, they let you know it when they disapprove of something you're saying or doing -- and after a while, you feel afraid to speak your mind, to act in the ways that are most natural to you, because you know they won't like it. This may sound harsh, but keep in mind that this person doesn't mean to treat you in this way -- it's an old, unconscious dynamic rearing its ugly head again. It is within your control, if you're aware of it from the start. You should strive to be yourself and speak your mind -- even when you say something your partner doesn't like or expect. Encourage them to learn to love the differences between you, and the fact that you're both individuals.